0.128		2022-10-02	T. R. Wyant
    Localize $_ before while(<>).

0.127		2022-08-12	T. R. Wyant
    Heavens-Above updates magnitude of Chinese Space Station.
    
    Kelso adds 29093 to his visual satellite list.

0.126		2022-07-03	T. R. Wyant
    Kelso drops OID 26102, adds 51842 to his visible objects lists,
    which forms the basis for the canned magnitude table. The latter has
    no magnitude yet.

0.125		2022-06-14	T. R. Wyant
    Add canned magnitude of 26102 (MTI)

0.124		2022-05-21	T. R. Wyant
    Use Heavens Above as the source of canned absolute magnitudes.

0.123		2022-04-09	T. R. Wyant
    Fix truncation problem in rad2dms().  You can now specify your own
    degree sign as the third argument to this subroutine.  The default
    is the Unicode degree sign, "\N{U+00B0}".

    Fix similar potential truncation problem in rad2hms().

0.122		2021-11-10	T. R. Wyant
    Add CONTRIBUTING file

    Document demise of Willmann-Bell and the transfer of their assets to
    Sky and Telescope.

0.121		2021-08-08	T. R. Wyant
    Fix implementation of Borkowski's algorithm for converting
    geocentric to geodetic coordinates.  An edge case in my
    implementation resulted in a divide-by-zero error at geocentric
    latitude 90 degrees.  Thanks to Jason Venner for reporting this
    issue.

    Address divide-by-zero in azel() velocity calculation when range is
    0.  Because some effort has been made to provide a position result
    in this case (rather than an error), I decided that since the
    velocity is undefined in this case I would just not return it.
    Thanks to Jason Venner for reporting this issue.

    Correct generation of 'provides' metadata.  Thanks to Favio Poletti
    for blogging
    https://github.polettix.it/ETOOBUSY/2021/06/15/the-real-pause-workaround/,
    and ultimately to Joel Berger for the pointer to
    https://metacpan.org/pod/CPAN::Meta::Spec#no_index

0.120		2021-05-20	T. R. Wyant
    Use Heavens-Above intrinsic magnitude for Tianhe and the ISS.

    Tweak Math Doctors acknowledgement for haversine article recovery.

0.119		2021-04-16	T. R. Wyant
    Update haversine link to point to "The Math Doctors" web site

    Fix clone(), and test to ensure it stays fixed.

0.118		2021-04-01	T. R. Wyant
    Add rt.cpan.org back to bug reporting methods. Long live RT!

    Refactor authortest into three, to eliminate the need for stub files
    to test without optional modules.

    Remove references to the NASA Human Space Flight web site, since it
    has been taken down.

    Fix broken POD links. Most were in script/satpass, but the "Ask Dr.
    Math" link on haversines is also gone, because the teachers'
    association that took it over from Drexel has decided that their
    function is to restrict knowledge, not disiseminate it.

    Get prerequisites up to snuff, and add xt/author/prereq.t to ensure
    they stay that way.

0.117		2021-01-01	T. R. Wyant
    Fix bug in Astro::Coord::ECI::Sun next_quarter(). This bug was
    introduced in version 0.089 (released 2018-02-02) when I replaced an
    iterative calculation with Meeus' closed-form algorithm. The bug was
    in my interface to Meeus' algorithm, and manifested only between the
    last quarter and the end of the year. It did not manifest if you set
    Sun attribute 'iterate_for_quarters', which caused the old algorithm
    to be used.

    Use GitHub as bug tracker. R.I.P. rt.cpan.org.

    Add Travis CI testing.

    Remove Tiangong 2 from canned magnitude table

0.116		2020-09-10	T. R. Wyant
    Remove all mention of subs nutation_*, obliquity, and friends, which
    were defined in Astro::Coord::ECI::Utils. These were replaced by
    methods.

0.115		2020-08-19	T. R. Wyant
    Remove prototypes from testing subroutines defined in t/*.t and
    inc/My/Module/Test/*.pm

    Update canned satellite magnitude table.

0.114		2020-06-25	T. R. Wyant
    Document undef as argument to equation_of_time()

    Update canned magnitude table per Kelso.

    Correct heliocentric_ecliptic*(), I hope. I don't have worked
    examples, but at least the current computation is sane in that the
    heliocentric coordinates of the Earth are the complement of the
    geocentric coordinates of the Sun.

0.113		2020-03-07	T. R. Wyant
    Subroutines equation_of_time(), nutation_in_longitude(),
    nutation_in_obliquity(), and obliquity() are now fatal. They were
    deprecated in favor of Astro::Coord::ECI methods equation_of_time(),
    nutation(), and obliquity(). The reason for the change was to allow
    classes access to higher-precision versions of these calculations if
    desired (e.g. the Astro::Coord::ECI::VSOP87D::* classes).

0.112		2020-01-26	T. R. Wyant
    Add Astro::Coord::ECI::Utils subroutines greg_time_gm() and
    greg_time_local(), which convert date and time into epoch time.
    Unlike time_gm() and time_local() (which interpret the year however
    Time::Local timegm() and timelocal() do), the new routines always
    interpret the year as Gregorian. The older routines are now
    discouraged, and have been eliminated in this package's code.

0.111		2020-01-11	T. R. Wyant
    Fix Y2020 bug.

    The problem here was Time::Local's weird handling of years less 100,
    which is inconsistent with the gmtime() and localtime() built-ins, to
    wit: years less than 100 are considered to be within 50 years of the
    current year. As of January 1 2020, 70 became no longer 1970 (the usual
    epoch year) but 2070.

    As far as I can determine the only impact was in a test that contained
    an adjustment for systems that might have a non-Unix epoch.

    The solution was to specify a four-digit year in the test, and to use
    Time::Local's timegm_modern() and timelocal_modern() where available.

    Thanks to Chris Williams (BINGOS), who uncovered this in one of his CPAN
    tester systems.

    CPAN TESTERS ROCK!

    Suppress 'Ambiguous use of -PIOVER2' under 5.10.1. Thanks to Chris
    Williams (BINGOS) for finding this.

    Eliminate redirections in POD URL links

0.110		2019-10-04	T. R. Wyant
    Validate horizon and almanac_horizon. This is pretty much the same
    situation as twilight -- they were completely unvalidated, but are
    now restricted to the range - PI/2 to PI/2 radians, inclusive.

0.109		2019-09-08	T. R. Wyant
    Further deprecate nutation and obliquity subroutines in favor of the
    same-named methods. Subroutine calls now always result in a warning.
    In six months they will be fatal.

0.108		2019-08-29	T. R. Wyant
    Validate 'twilight' attribute. It must be between -PI/2 and PI/2
    inclusive. Thanks to Kay Kilpatrick for bringing this to my
    attention.

    Correct eval() check in load_module().

0.107		2019-08-03	T. R. Wyant
    Fix broken POD links and add a test to ensure they stay fixed.

    Add low-level subroutine position_angle() to
    Astro::Coord::ECI::Utils.

    Allow station argument to equatorial_apparent() method.

0.106		2019-05-13	T. R. Wyant
    Added some canned satellite magnitudes, mostly in the range of 4.5
    to 5 or so.

0.105		2019-03-19	T. R. Wyant
    Require at least Scalar::Util 1.22. With profound thanks to Nigel
    Horne for testing on versions of Perl old enough to expose the need
    for this.

0.104		2019-03-09	T. R. Wyant
    Correct error message definition in sgp4r().

    Have the null model return its invocant.

    Nutation and obquity subroutines now warn on first use. These (and
    equation_of_time(), which uses them) are deprecated in favor of the
    relevant methods. The motivation was to allow higher-accuracy
    implementations where appropriate (e.g.
    Astro::Coord::ECI::VSOP87D::*).

    Try to kill undef errs in 'brightest' calc.

    Correct version in Southern-hemisphere and ::Utils deprecation
    notices.

    Add eg/maidenhead

    Make ::TLE::Iridium optional in script/satpass

0.103		2018-11-03	T. R. Wyant
    RT 127488: Load default Sun class before use
    
    This actually manifested in RT 127463 against SVG-Calendar. The smallest
    self-contained piece of code to tickle this is
      use Astro::Coord::ECI;
      Astro::Coord::ECI->new()->get( 'sun' );
    
    The bug was introduced (or maybe just exacerbated) in version 0.100_01,
    which was where I added support for alternate Sun classes. In the course
    of this, 'use Astro::Coord::ECI::Sun' was dropped from
    Astro::Coord::ECI::Moon and Astro::Coord::ECI::Star. The former is
    involved in the SVG-Calendar problem.
    
    Thanks to Slaven Rezic for spotting this in his smoker, submitting the
    original RT ticket, and adding me to it with the note that it seemed
    only to be a problem with recent versions of Astro-satpass.

0.102		2018-09-24	T. R. Wyant
    Almanac descriptions are now sensitive to object name. That is to
    say, if for some reason you designate a different name for the Sun,
    almanac descriptions will reflect that.

    The mutator for the 'sun' attribute now requires the new value to be
    a member of $self->SUN_CLASS(), rather than SUN_CLASS. This way a
    subclass can place more stringent restrictions on it.

    Also it turns out that the 'sun' attribute was never documented. So it
    is now.

0.101		2018-09-07	T. R. Wyant
    Move nutation, obliquity, equation_of_time to Astro::Coord::ECI.
    They become methods rather than subroutines so that they can be
    overridden when higher accuracy is needed.

    Install @CARP_NOT in all modules.

    Have Moon and Star use correct Sun object for phase, aberration

    Have the Sun's 'sun' attribute be itself. Access to it returns the
    invocant, and mutations are ignored.

    Add Utils functions rad2dms() and rad2hms()

    In the script/satpass script, update all contained objects when the
    'illum' or 'sun' settings are changed.

0.100		2018-07-22	T. R. Wyant
    Add non-TLE attributes as optional hash reference to parse().
    Actually, this already worked for traditional TLEs, it just needed
    to be documented. But it needed to be added to the JSON code.

    Fix $eci->set( sun => ... ). The mutator was not in fact setting the
    new value of the attribute. Included in this is support for changing
    the static (i.e. default) value of the attribute.

    Make singleton Sun & Moon per-class. This is so that you always get
    back the same class you requested if there is more than one class
    that can represent each body (say, at different accuracies).

    Pull out Astro::Coord::ECI::TLE::Iridium as separate distribution.
    The canned statuses went with it.

0.099		2018-06-29	T. R. Wyant
    Canned status update:

    - Iridium 41 failed
    - Iridium 65 spare
    - Iridium 67 failed
    - Iridium 75 failed
    - Iridium 81 failed

    Move iridium status setup to Astro::Coord::ECI::TLE::Iridium. This
    is in preparation for spinning off that module into its own package.

0.098		2018-06-16	T. R. Wyant
    Canned status update:

    - Iridium 18 failed
    - Iridium 67 spare
    - Iridium 68 decayed
    - Iridium 75 spare

0.097		2018-06-04	T. R. Wyant
    Large canned status update:

    - Iridium 7 failed
    - Iridium 11 spare
    - Iridium 15 spare
    - Iridium 18 spare
    - Iridium 21 decayed
    - Iridium 31 spare
    - Iridium 37 decayed
    - Iridium 39 failed
    - Iridium 46 failed
    - Iridium 47 spare
    - Iridium 55 spare
    - Iridium 58 spare
    - Iridium 61 spare
    - Iridium 62 spare
    - Iridium 68 failed
    - Iridium 81 spare
    - Iridium 90 failed
    - Iridium 96 failed
    - Iridium 97 spare

Decays are from Space Track. Other status changes are from Dr. T. S.
Kelso's Celestrak web site. "Spare" conflates several Celestrak
statuses; the above spares are typically "[B]" (backup) or "[P]" (partly
operational).

0.096		2018-05-23	T. R. Wyant
    Link to metacpan.org rather than search.cpan.org.

    Canned status updates:
    - Decay of Iridium 25
    - Decay of Iridium 72
    - Iridium 64 now spare per Kelso
    - Iridium 66 now spare per Kelso
    - Iridium 68 now spare per Kelso
    - Iridium 71 now spare per Kelso

0.095		2018-05-08	T. R. Wyant
    Iridium 13 decayed. Canned status update.

0.094		2018-04-27	T. R. Wyant
    Kelso drops Tiangong 1 from visual.txt. This results in a change to
    the canned magnitude table.

    Update canned Iridium status table for:
    - Decay of Iridium 19 and 94;
    - Mark Iridiums 29, 33, and 72 spare per Kelso.

    Prefer /[0-9]/ to /\d/ for matching digits. The latter matches
    non-ASCII digits as well as ASCII ones, but the former is what I
    want, because usually once there is a match numeric conversion
    happens.

0.093		2018-04-05	T. R. Wyant
    Iridium 23 decayed March 28 2018. This necessitates updating all the
    canned Iridium status tables.

    Kelso marks Iridiums 12, 13 & 76 partly operational. This translates
    to "SPARE" in the Iridium status table.

0.091		2018-03-10	T. R. Wyant
    Kelso marks Iridium 94 as partly operational. Updated canned status
    to call it spare.

    Use manifest constants for reference types. That is, instead of
    'ARRAY', use ARRAY_REF, defined using 'use constant', and so on.

0.090		2018-02-22	T. R. Wyant
   Update canned Iridium status table for decay of Iridiums 3, 43 and
   49, and making 3, 23, and 46 spare per Kelso.

0.089		2018-02-02	T. R. Wyant
    Kelso marks Iridiums 3, 37, 49 as "P" ("partly operational"). This
    is "spare" in my classification. Sladen calls 3 failed, but I'm
    using the Kelso data in the canned status table in
    Astro::Coord::ECI::TLE.

    Fix problem with Astro::Coord::ECI::Sun when Time::y2038 used.

    New algorithm for equinoxes and solstices. The new algorithm is from
    Jean Meeus' "Astronomical Algorithms." 2nd edition, chapter 27
    ("Equinoxes and Solstices"), and should be more accurate, at least
    for reasonably current times.

    If you want the old iterative algorithm back, you can set new
    attribute 'iterate_for_quarters' to a true value.

    Correct typo in calculation of Sun's postion. The correction
    produced no change in the equinoxes and solstices calculated by
    iteration.

    Add eg/usno-seasons. This displays equinoxes and solstices for a
    given year, both as computed by Astro::Coord::ECI::Sun and as
    downloaded from the United States Naval Observatory.

0.088		2018-01-16	T. R. Wyant
    Iridium 34 decayed January 8 2017. So marked in canned status.

0.087		2017-12-30	T. R. Wyant
    Iridium 6 decayed December 23 2017. Update canned status for this.

    Kelso marks Iridium 34 tumbling, 96 partial December 22 2017. Update
    canned status for this.

    Kelso marks Iridiums 6, 19 & 22 as tumbling. Canned status table
    updated to reflect this.

0.086		2017-12-06	T. R. Wyant
    Mark Iridium 8 as decayed in canned status table.

0.085		2017-11-24	T. R. Wyant
    Kelso says Iridiums 5, 8, and 51 are tumbling. Canned status updated
    to reflect this.

0.084		2017-10-12	T. R. Wyant

    Add support for decayed Iridium satellites:

    * Carry them in canned status table

    * Have can_flare( 'all' ) return true regardless of satellite
      status.

    All this was triggered by Kelso's recognition that Iridium 77 had
    decayed.

0.083		2017-09-13	T. R. Wyant

    Add -decayed to eg/visual.

    This eliminates decayed bodies. I decided not to remove these from
    the magnitude table because of historical interest.

    Kelso removes 38253 from visual.txt. Decayed 2017-08-18.

    Kelso marks 25471 Iridium 77 failed

    Kelso marks 24949 Iridium 30 failed

    Kelso adds 33411 to visual.txt.

    Kelso adds 11251 METEOR 1-29 to visual.txt

    Use qsmag instead of mcnames to suppliment magnitudes in the canned
    magnitude table.  As of July 24 2017 mcnames appeared to be
    double-compressed and corrupt besides. Both are maintained by Mike
    McCants, but the former is input to his QuickSat program and so
    likely to be less fragile. I hope. The mcnames file was eventually
    corrected, but I am sticking with qsmag for now.

    Kelso reports decay of Iridium 74.

0.082		2017-06-14	T. R. Wyant
    Kelso reports Iridium 79 out of service.

0.081		2017-05-26	T. R. Wyant
    Update canned magnitude table.

    Deprecate McCants' status. His web page notes itself as no longer
    maintained.

    Document impending changes in Iridium support.

    Kelso reports Iridiums 43 & 82 tumbling. Canned status changed in
    Astro::Coord::ECI::TLE to reflect this.

0.079		2017-04-26	T. R. Wyant
    Move satpass script from bin/ to script/

    Mark OID 25041 (Iridium 40) tumbling, and 25042 (Iridium 41) spare
    per Kelso. The latter appears to have actually been declared spare
    in July 2016, but somehow I missed updating the canned status table.

    Kelso added OID 16719 (COSMOS 1743) to magnitudes

0.078		2017-02-10	T. R. Wyant
  Fix L<> links, and things that should have been L<> but were not.
    Thanks to Ben Bullock for the pull request.

  Add 'provides' data to ExtUtils::MakeMaker output

  Add 'base' to dependencies.

0.077		2016-12-03	T. R. Wyant
  Remove leading 0 from Space Track 3le names

  Handle year incompatibility between Time::Local and Time::y2038
    This is the same problem as RT #118861 on Astro-App-Satpass2, and I
    applied the same solution. As a result of this,
    Astro::App::Satpass2::Utils now exports time_gm() and time_local().

0.076		2016-11-06	T. R. Wyant
  Clean up Changes file. Version 0.075 had raw Git log for changes.
    Oops.

0.075		2016-11-06	T. R. Wyant
  Add estimated magnitude for Tiangong 2.
    Since I believe (per Wikipedia) that it is the same size as Tiangong 1,
    I am estimating the same absolute magnitude (4.0).

0.074		2016-09-04	T. R. Wyant

  Add HISTORICAL CALCULATIONS section to OVERVIEW.

  Correct almanac_hash() methods when station is defaulted to the body's
    station attribute rather than explicitly passed.

  Add eg/solstice

0.073		2016-08-07	T. R. Wyant
  Update Celestrak visual.txt date. No data change.

  Update canned Iridium statuses and magnitudes in
    Astro::Coord::ECI::TLE.

  Tweak satpass script geocoding heuristics.

  Tweak eg/visual for Perl 5.6.2.

0.072		2016-07-02	T. R. Wyant
  Set canned status for Iridium 57 (OID 25273) failed per Kelso.

0.071		2016-01-06	T. R. Wyant
  Add GitHub repository to metadata.

  Change satpass script to geocode using OSM.
    Also fix apparent bit rot in show command.

  Correct Astro::Coord::ECI->next_elevation(). Elevation was being
    calculated inconsistently, resulting in incorrect rise/set and
    begin/end twilight results inside the Arctic and Antarctic Circles
    on days when the Sun did not rise or set. This error may have been
    introduced in March 2012 with version 0.049_01, though it may go
    back to the original release. Thanks to Adam Osuchowski for finding
    this.

0.070		2015-06-25	T. R. Wyant
  The Astro::Coord::ECI::Sun almanac() method now returns the correct
    quarter descriptions (equinox, solstice) when the 'station'
    attribute is set to a location south of the Equator. The event
    detail (which is encoded as a number) does not change, but is now
    documented to refer to 'March equinox', and so on.

  Add -date option to eg/almanac

0.069		2015-06-07	T. R. Wyant
  Update canned status of Iridium 63 (OID 25286)

0.068		2015-03-26	T. R. Wyant
  Make the satpass script time zone functionality work with Date::Manip
    versions 6.49 and greater.

  Track changes in Mike McCants' magnitude data.

0.067		2014-11-10	T. R. Wyant
  Fix failure in t/tle_support.t. I hope.

  Add OID 15494 to canned magnitude table.

0.066		2014-10-16	T. R. Wyant
  Update Iridium 42 (OID 25077) to failed, per Kelso.

  Regenerate canned magnitude table.

  Croak on encountering JSON key SATNAME. This was replaced by
    OBJECT_NAME during the REST interface's beta.

  Remove installer question about installing satpass, per documented
    deprecation schedule.

0.065		2014-07-27	T. R. Wyant
  Prevent TLE manufacture for oddball objects.

  Add TLE pass variant PASS_VARIANT_TRUNCATE, which truncates passes to
    the beginning and end times given to pass(), rather then computing
    complete passes (and therefore requiring the satellite to rise and
    set).

  Expose Space Track time formatting and decoding routines for possible
    use by subclasses. The key routines __to_json() and __from_json()
    are still undocumented and considered highly experimental, though.
    Sorry.

  Add OID 00694 to Astro::Coord::ECI::TLE canned magnitudes.

0.064		2014-05-29	T. R. Wyant
  Add Astro::Coord::ECI::TLE method illuminated()

0.063		2014-05-02	T. R. Wyant
  Allow PASS_VARIANT_BRIGHTEST event even if the 'visible' attribute is
    false.

  Document magnitude functionality in satpass script.

  Add pass variant PASS_VARIANT_BRIGHTEST. If this is set, an event
    representing the time the satellite is brightest will be added to
    the pass. This is ignored if the calculation can not be made (e.g.
    if 'visible' is false, or 'intrinsic_magnitude' is undefined).

  Clarify Astro::Coord::ECI::Moon phase() docs.

  Eliminate uses of each() built-in.

  Add magnitude functionality to satpass script.

0.062		2014-04-01	T. R. Wyant
  Update canned status for Iridium 29 (24944). Kelso says it's tumbling.

  t/tle_json.t now only dumps versions on an error.

  Require correct Perl version in t/tle_mag.t

  In t/tle_json.t, work around problem that occurs when JSON::XS encodes
    a number in a locale that uses a comma as the decimal point, such as
    'de_DE.UTF-8'. Make a note of this in Astro::Coord::ECI::TLE, since
    there is nothing I can do in my code to actually fix the problem.

  The 'unpack' built-in does not default to $_ as the buffer to unpack
    under Perls before 5.10.

  Have Astro::Coord::ECI::TLE magnitude() method set the station's time.

  Correct logic for building the fold_case() utliity subroutine under
    Perls before 5.16.

  Computation of (perhaps very) approximate magnitudes for satellites is
    now supported. Changes to support this include:

    - A magnitude() method on all classes that represent satellites;

    - An intrinsic_magnitude attribute (defaulting to undef) on
      Astro::Coord::ECI::TLE objects;

    - Default intrinsic_magnitude to 7 on
      Astro::Coord::ECI::TLE::Iridium objects;

    - A canned table of intrinsic magnitudes in Astro::Coord::ECI::TLE
      which includes most of the objects in the Celestrak visual list,
      with magnitudes from Mike McCants' mcnames.zip and vsnames.zip
      files;

    - Support in the Astro::Coord::ECI::TLE parse() method to set the
      magnitude of satellites that are in the table;

    - Static method magnitude_table() on Astro::Coord::ECI::TLE to
      maintain the canned magnitude table;

    - Modify the Astro::Coord::ECI::Sun magnitude() method to take an
      observing station argument (which is ignored) to be consistent
      with the same-named Astro::Coord::ECI::TLE method.

  The precess() and precess_dynamical() methods now do nothing to
    objects set to Earth-fixed coordinates. Previously they were
    converted to Ecliptic (and therefore inertial) coordinates, which
    manifested as a bug when the observing station was an attribute of a
    star.

  Support new (to us) Space Track JSON keys FILE, OBJECT_TYPE, ORDINAL
    and ORIGINATOR with same-named (except for being lower case)
    attributes.

  Method body_type() now returns the 'object_type' attribute if that is
    defined. If not it computes its return from the object name, like it
    always has.

0.061		2014-01-13	T. R. Wyant
  On install, warn that I intend to remove the 'install satpass'
    question asked by Build.PL and Makefile.PL. The only way to install
    the satpass script will be to run Build.PL or Makefile.PL with the
    '-y' option. Also warn of eventual package name change, from
    'Astro-satpass' to 'Astro-Coord-ECI'.

  Warn every time Astro::Coord::ECI::TLE->parse() encounters JSON key
    SATNAME. This was removed while Space Track's REST interface is
    still in beta.

  Computation of a Doppler shift based on the station's 'frequency'
    attribute is now fatal. The body's 'frequency' attribute should be
    set instead.

  Remove all references to the satpass 'lit' setting and the
    corresponding Astro::Coord::ECI 'limb' attribute, which were
    deprecated out long since.

  Remove all mention of the 'upper' argument to the Astro::Coord::ECI
    azel() method. It's still an exception to pass a second argument,
    though.

  Remove all references to SOAP::Lite in the satpass code, except for
    POD saying it was gone.

  Various changes to Astro::Coord::ECI::TLE to try to support
    prospective classes representing non-orbiting objects. These are
    experimental, and may change or be retracted with little or no
    notice. The hope is a class that can represent the objects in one of
    NASA's .kmz files that are published for certain launches. These
    include:

    * Refactoring illumination and periodic position calculations in the
      pass() method;

    * Add public method intrinsic_events(), which returns events
      intrinsic to the body, rather than observational ones like rise
      and set, and call it in the pass() method;

    * Add protected (and therefore doubly experimental) method
      __pass_backup_earliest() to limit how hard the pass() method tries
      to find a rise time when the pass starts with the body above the
      horizon.

    I have no idea whether the class this is in support of will ever see
    the light of day.

  Improve Astro::Coord::ECI::Utils::find_first_true() documentation.

0.060		2013-12-18	T. R. Wyant
  In eg/almanac, correct the handling of -sun and -moon when exactly one
    is specified.  The erroneous processing forced both to be asserted
    in all circumstances. Thanks to Mike Donn for reporting the
    problem. and pointing out the solution.

0.059		2013-12-03	T. R. Wyant
  Make the zero-argument form of the maidenhead() method conform to the
    docs.

0.058		2013-11-25	T. R. Wyant
  Handle undef period in pass(). At the moment it's handled by fudging in
    90 minutes, which is bogus, but lets me experiment objects whose
    motion is defined by a list of positions.

  Add a paragraph on how passes are detected to the
    Astro::Coord::ECI::TLE pass() documentation.

  In the satpass script, implement 'sky lookup' in terms of
    Astro::SIMBAD::Client script() rather than query(), so that we do not
    need SOAP::Lite.

0.057		2013-07-08	T. R. Wyant
  Deprecate the satpass script.

  Modify the appulse algorithm when the appulsing body is a satellite,
    since the original algorithm did not necessarily converge to the
    correct time for satellites in similar orbits. Thanks to Vidar
    Tyldum for bringing this to my attention, and working with me on it.

  Go back to simply allowing invalid international launch designators.
    They started getting rejected about release 0.051_01 (2012-08-18).
    Thanks to Vidar Tyldum for bringing this to my attention, and
    working with me on it.

  Take spaces as equivalent to zeroes in numeric fields (which I believe
    is the old FORTRAN behavior), and in the numeric portions of the
    international launch designator.

  As a consequence of the above, the 'international' attribute will be
    zero-filled on retrieval.

  Update docs. Replace 'location' by 'station' where that is what is
    meant. Add a (very brief) explanation of times to the overview. Also
    add information on the Space Track REST interface to the overview.

  Deprecations:

  * The two-argument form of azel() is now fatal.

  * The satpass script fails if you try to geocode without
    Geo::Coder::Geocoder::US.

  * Use of the satpass script 'lit' setting is now fatal; instead use
    'edge_of_earths_shadow'.

  * Use of the Astro::Coord::ECI::TLE 'limb' attribute is now fatal;
    instead use 'edge_of_earths_shadow'.

  * Feeding a JSON file to Astro::Coord::ECI::TLE->parse() which uses
    the SATNAME key is deprecated, and produces a warning. This warning
    will become fatal in the future. Instead use OBJECT_NAME.

  * Warn every time a Doppler shift is computed using the station's
    frequency. This will become fatal in the future. The frequency
    should be set on the orbiting object.

0.056		2012-12-08	T. R. Wyant
  Deprecation warnings:

  * The Doppler calculation warns the first time the frequency comes
    from the station rather than the satellite.

  * The satpass script warns every time geocoding is done if
    Geo::Coder::Geocoder::US is not installed.

0.055		2012-10-27	T. R. Wyant
  Workaround for problem with Date::Manip clobbering $ENV{PATH} when it
    is loaded.

  T. S. Kelso recorded Iridium 4 (OID 24796) as being out of service
    about midnight 20-Oct-2012 GMT. I have updated the canned status,
    since I know he calls Iridium LLC to get the status.

  Have the Astro::Coord::ECI::TLE status() method take optional OID
    arguments for the 'show' subcommand.

0.054		2012-10-09	T. R. Wyant
  Correct field TLE_LINE0 in the JSON TLE generated by
    Astro::Coord::ECI::TLE to include the leading '0 '.

  INCOMPATIBLE CHANGE: In the JSON representaion of a TLE, the common
    name of the body is now OBJECT_NAME, not SATNAME. This was done to
    track the usage of Space Track, which did not previously have the
    common name in its TLE data. The SATNAME field will still be used if
    it appears in input, but is being put through a deprecation cycle.

0.053		2012-09-10	T. R. Wyant
  Suppress the 'OK' after an st( set => ...) in the satpass script.

  Address satpass script Term::ReadLine load failures under the test
    harness by doing the load in an eval, and falling back to the
    non-ReadLine case.

  Update the canned status table in Astro::Coord::ECI for the fact that
    both Sladen and McCants call Iridium 51 (OID 25262) in service.

0.052		2012-09-05	T. R. Wyant
  Per schedule, the following deprecated items will produce a warning on
    each use:

    * The 'upper' argument of the Astro::Coord::ECI azel() method;

    * The Astro::Coord::ECI::TLE 'limb' attribute;

    * The satpass 'lit' setting.

  All these warnings will become fatal in the first release on or after
  March 1 2013.

  Remove support for the 'horizon' setting of the Astro::Coord::ECI
    'almanac_horizon' attribute. This was introdiced in 0.051_01, but on
    second thought I decided the 'horizon' logic was ill-conceived.

  Change the JSON representation of the International Launch Designator
    to track Space Track change by Space Track to REST predicate
    INTLDES.

  Further corrections to t/tle_json.t for OS-dependant failures.

  Enhance Astro::Coord::ECI::TLE->parse() to parse Iridium status off
    the name if it is present.

  Fudge the JSON in t/tle_json.t for system-to-system differences in
    floating point representations (2-digit vs 3-digit exponent).

  Remove the -json output formatting option from the satpass tle()
    command. Instead, provide eg/convert_tle.

  Add attribute almanac_horizon to Astro::Coord::ECI. This sets the
    horizon for almanac calculations. The default is 0 (radians), but
    other values are possible, as well as 'horizon' (meaning, use the
    value of the 'horizon' attribute) and 'height' (meaning, depress the
    horizon for the height of the observer above sea level). The satpass
    script allows access to this.

  Add JSON support for Astro::Coord::ECI::TLE and
    Astro::Coord::ECI::TLE::Iridium. This includes the ability of
    Astro::Coord::ECI::TLE->parse() to handle JSON orbital elements from
    the Space Track REST interface (provided the optional JSON module
    can be loaded), and hooks in both classes for them to serialize
    themselves into Space-Track-like JSON.

  Add -json option to the satpass script's tle() command, to get
    canonical JSON output.

  Make use of DateTime (if available) to interpret a non-numeric
    Astro::Coord::ECI::TLE::Iridium zone attribute. If DateTime is not
    available, fall back to the old implementation of setting $ENV{TZ}
    and hoping localtime() responds to this.

  Correct the documentation of the Astro::Coord::ECI 'twilight'
    attribute, which really can not be set to 'civil', etc.

0.051		2012-06-08	T. R. Wyant
  Use YAML instead of YAML::Any, since they are both in the same distro,
    and YAML does not suffer from deprecation warnings.

  Add pass variant PASS_VARIANT_NO_ILLUMINATION. If attribute 'visible'
    is false, this causes no illumination calculations at all to be
    done.  This seems to save 20% in calculation time, but your mileage
    may vary, especially inside the Arctic or Antarctic Circles.

  Have bin/satpass warn the first time it geocodes if geocoding is done
    directly using SOAP::Lite.

  Make the Astro::Coord::ECI azel_offset() Doppler calculation
    contingent on the availability of a radial velocity value.

  Reinstate the Doppler calculation in Astro::Coord::ECI's
    azel_offset(). Thanks to Vidar Tyldum for finding this omission.
    While in the Doppler code, made the satellite the primary source of
    the frequency. Getting the frequency from the observer object is
    being put through a deprecation cycle, and will eventually result in
    an error.

0.050		2012-05-04	T. R. Wyant
  The 'status iridium' command in the 'satpass' script is now fatal;
    it has been deprecated in favor of 'status show' for some time,
    issued a warning on every use since version 0.044.

  Have Astro::Coord::ECI method heliocentric_ecliptic_cartesian() set
    the object's {inertial} to true.

  Add module Astro::Coord::ECI::Mixin to provide common-logic methods
    which do not seem to fit the object hierarchy.

  Promote method ecliptic_longitude() from Astro::Coord::ECI::Sun to
    Astro::Coord::ECI.

  In Astro::Coord::ECI:

    * Add attribute 'sun', to hold the object used to convert to and
      from Heliocentric coordinates.

    * Add methods ecliptic_cartesian(), heliocentric_ecliptic(), and
      heliocentric_ecliptic_cartesian().

    * Consolidate code for conversion between Cartesian and spherical
      coordinates.

  In Astro::Coord::ECI::Set:

    * Have the aggregate() method _not_ aggregate TLEs that have a blank
      ID and model 'null'. This piece of ad-hocery was necessary to
      prevent aggregation of "fake" TLEs representing different fixed
      points in space (e.g. as created by the satpass or satpass2
      'geodetic' command).

0.049		2012-03-12	T. R. Wyant
  In the Astro::Coord::ECI precess_dynamical() method, set the time of
    the station attribute (if any) before precessing it.

  In Astro::Coord::ECI::TLE, throw an exception if the Sun never rises.
    This should not happen, but was encountered while sorting out the
    precess_dynamical() bug.

  Independently test appulses of all relevant classes, since this is how
    the precess_dynamical() bug manifested.

  In Astro::Coord::ECI::TLE::Set, override the get() method, and have
    get( 'tle' ) return the concatenated TLEs of all members.

  In Astro::Coord::ECI::TLE::Iridium reflection() method, fix
    two-argument azel() call.

0.048		2012-03-08	T. R. Wyant
  Add keplers_equation() to Astro::Coord::ECI::Utils.

  In the 'satpass' script's pass() subroutine, set the 'station'
    attribute of all bodies in the @sky array before passing them to the
    Astro::Coord::ECI::TLE pass() method.

  In the Astro::Coord::ECI::TLE::Iridium flare() method, set the
    'station' attribute of the object that represents the center of the
    flare.

  Have the first use of the Astro::Coord::ECI::TLE 'limb' attribute, the
    satpass script 'lit' setting, and the Astro::Coord::ECI azel()
    method with an 'upper' argument display a warning. These were
    deprecated in September 2011.

  In Astro::Coord::ECI:

  * Have next_azimuth(), next_elevation(), and next_meridian() make use
    of the 'station' attribute if the invocant is the only
    Astro::Coord::ECI argument.

  Have Astro::Coord::ECI::TLE->parse() take, as an optional first
    argument, a reference to a hash that is used to initialize
    attributes not initialized by parsing the TLE data.

  Convert all eg/ scripts to use the 'station' attribute where possible,
    and the optional Astro::Coord::ECI::TLE->parse() hash argument where
    practical.

  In Astro::Coord::ECI:

  * Add 'station' attribute, as origin of observer-centered coordinate
    systems. If azel() is called with the invocant as the only
    Astro::Coord::ECI argument, it returns the coordinates of the
    invocant relative to the 'station' attribute.

  * Factor out the Cartesian portion of the azel() method, and add
    methods neu() and enu(), to provide local Cartesian coordinates
    relative to the 'station' attribute.

  * Add method equatorial_apparent(), to calculate apparent equatorial
    coordinates as seen from the location in the 'station' attribute.

  * Work on velocity transformations from eci() to ecef(), neu(), enu(),
    azel(), and equatorial(). All these seem sane to me, though I still
    have no worked examples to test against.

  I intend the use of the 'station' attribute to be the preferred way to
  get observer-relative coordinates. I would like to eventually
  deprecate $station->azel( $body ) and friends, as well as the practice
  of passing an explicit station to the pass() and flare() methods, but
  whether this actually happens is another question.

0.047		2012-01-20	T. R. Wyant
  Have the functionality related to the Astro::Coord::ECI::TLE
    'pass_threshold' attribute (introduced in 0.046) take visibility
    into account if the 'visible' attribute is true.

0.046		2012-01-18	T. R. Wyant
  Add Astro::Coord::ECI::TLE attribute 'pass_threshold'. If set to
    something (in radians) other than undef, the sattelite's highest
    point during a pass must be at least this high for the pass to be
    reported.

  Support the 'pass_threshold' setting in the satpass script.

  Optional code that used to feel around for a YAML implementation now
    just uses YAML::Any.

  The utility subroutines deg2rad() and rad2deg() now support an
    argument of undef which, unsurprisingly, returns undef.

  The Changes file now conforms to Test::CPAN::Changes, and the author
    test xt/author/changes.t has been added to keep it so.

0.045		2011-12-05	T. R. Wyant
  Have the satpass script's geocode command favor
    Geo::Coder::Geocoder::US. Deprecate the use of SOAP::Lite.

  Have the satpass script set the height to 0 if the position was set by
    the geocode command, but height() failed.

  Update the copy of the GNU GPL in LICENSES/Copying to have the current
    FSF address.

  Document the release of Astro-App-Satpass2, and the eventual
    deprecation of the satpass script.

  Try to clarify how the atmospheric refraction calculation works.

0.044		2011-10-19	T. R. Wyant
  Require Test::More 0.88 for testing. The requirement was actually
    introduced in version 0.042. Thanks to Christopher Kybe for
    picking up this discrepancy.

  The satpass script's 'status iridium' command now generates a
    deprecation notice every time it is issued.

0.043		2011-08-29	T. R. Wyant
  The earthquake (Mineral Virginia USA) fire (Great Dismal Swamp) and
    flood (hurricane Irene) edition.

  Updated the canned Iridium status in Astro::Coord::ECI::TLE for
    McCants' and Sladen's reporting of Iridium 26 (OID 24903) as out of
    service. They also updated Iridium 23 (OID 24906) to show it in
    service rather than failed, but I have continued to follow Kelso in
    calling it a spare.

  Other than this, only documentation changes, mostly relating to the
    deprecation of the 'limb' attribute and its relation to the new
    'edge_of_earths_shadow' attribute.

  In the satpass script, use the new 'edge_of_earths_shadow' setting in
    the 'flare' and 'position' commands, though the flare calculation
    does not actually make use of it.

  Replace the Astro::Coord::ECI::TLE 'limb' attribute and the satpass
    'lit' setting with the 'edge_of_earth_shadow' attribute and setting.
    The new attribute and setting are numeric, and specify an increase
    in elevation (or decrease if negative) in units of the apparent
    radius of the body. The replaced attribute and setting still exist,
    but are deprecated, and will begin warning in the first release
    after March 1 2012. This setting/attribute is used by the pass
    calculation.

  Provide an Astro::Coord::ECI azel_offset() method, which takes, as its
    optional second argument, an offset applied to the elevation, in
    terms of the apparent radius of the body whose position is being
    calculated. The two-argument version of the azel() method is now
    deprecated, and will begin warning in the first release after March
    1 2012.

  Override the Astro::Coord::ECI correct_for_refraction() method in
    Astro::Coord::ECI::TLE, Astro::Coord::ECI::Moon, and
    Astro::Coord::ECI::Sun. The override simply returns the input
    elevation unmodified.

0.042		2011-08-07	T. R. Wyant
  In the Astro::Coord::ECI maidenhead() method:

  * Document the fact that, when used as a mutator, it sets the position
    of the center of the square;

  * Modify the accessor to try to minimize truncation error.

  Added t/eci_maidenhead.t.

0.041		2011-07-25	T. R. Wyant
  Re-fix longitude out-of-range warning in Astro::Coord::ECI::Moon.

  Fix problem with time specification in eg/sh_script when Date::Manip
    is not installed.

  Add attribute 'pass_variant' to Astro::Coord::ECI::TLE. This tweaks
    the output of the pass() method, and can be set to the bitwise 'or'
    (a.k.a. '|') of the following exported values:

    * PASS_VARIANT_NONE - No tweaks.

    * PASS_VARIANT_VISIBLE_EVENTS - Remove from the output all pass
      events which were not visible. Ignored if the 'visible' attribute
      is false.

    * PASS_VARIANT_FAKE_MAX - Create a 'max' event representing the
      largest visible elevation if the absolute max was filtered out by
      PASS_VARIANT_VISIBLE_EVENTS.

    * PASS_VARIANT_START_END - Report the first and last pass events as
      PASS_EVENT_START and PASS_EVENT_END. These are the same as
      PASS_EVENT_RISE and PASS_EVENT_SET unless the 'visible' attribute
      is true and PASS_VARIANT_VISIBLE_EVENTS is asserted.

  Minor optimization to the pass() method: the changes of 0.039_01
    through 0.039_05 left the appulse calculation before the point at
    which provisional passes were accepted or rejected. This has been
    moved below that point.

  New example script, eg/xml that makes use of the 'pass_variant'
    attribute, and generates XML from pass data using XML::Writer.

0.040		2011-07-06	T. R. Wyant
  Tried to make the documentation of the Astro::Coord::ECI::TLE
    lazy_pass_position clearer.

  Unconditionally set lazy_pass_position in the satpass script, since it
    recomputes position anyway.

  Added a few words to the OVERVIEW about how to get results more like
    those of the Heavens Above web site.

  Fix yet more problems in Astro::Coord::ECI::TLE->pass():

  * Do not report passes which ended before the prediction interval
    started.

  * Rework the implementation of the 'interval' attribute to be
    (hopefully!) more efficient, and to fix incorrectly-reported
    illuminations.

  * Fix incorrect rise (and sometimes max) times when the pass is in
    progress when the prediction interval starts and the 'visible'
    attribute is false.  The previous fix only worked if the 'visible'
    attribute was true.

  Add Astro::Coord::ECI::TLE attribute 'lazy_pass_position', to give the
    pass() method permission not to calculate and report event position
    if the event's time can be calculated without calculating position.

  The satpass script's 'verbose' setting now works as advertised.

  Re-fix the time-zone-dependant test failures in t/tle_flare.t.

  Fix more problems in Astro::Coord::ECI::TLE->pass():

  * Fix detection and calculation of events of visible passes which
    begin during the day, or any pass in progress at the beginning of
    the computation interval.

  Have Astro::Coord::ECI::TLE->parse() throw a warning if it can not
    understand the --effective date, and record the effective date as
    undef. Also allow --effective dates without a fractional part of the
    second.

  Add more tests to try to capture all these changes.

  Fix various problems in Astro::Coord::ECI::TLE->pass(), also brought
    to my attention by Jaap Meijers:

    * Incorrect time of maximum elevation when only one of the original
      one-minute samples is above the horizon.

    * Sporadic detection of passes which spend less than a minute above
      the horizon.

    * Potentially, sporadic detection of passes which spend less than a
      minute illuminated before daylight occurs. I have no examples of
      this, though.

  Add tests for Astro::Coord::ECI::TLE->pass(). More are needed.

  Make the Astro::Coord::ECI::TLE pass() method more lenient when
    screening for passes in which the satellite is illuminated. Thanks
    to Jaap Meijers for bringing this to my attention.

0.039		2011-04-29	T. R. Wyant
  Silence warnings about out-of-range longitude which are sometimes
    generated when computing the position of the Moon.

  Added -dump-headers command line option to eg/passes.

0.038		2011-04-14	T. R. Wyant
  Updated code that uses the optional Astro::SpaceTrack module to
    require version 0.052 wherever the Space Track web site is (or may
    be) accessed.

  Removed calls to _INSTANCE in little-used code in bin/satpass. It must
    be little-used, since it hasn't been imported from Params::Util
    since version 0.033 dated 17-Sep-2010.

  Fix to zone attribute code in bin/satpass, so that it can be cleared
    once set.

0.037		2011-04-04	T. R. Wyant
  Added a zone attribute to Astro::Coord::ECI::TLE::Iridium, so that it
    could properly distinguish between -am and -pm flares somewhere
    other than in the local zone. Thanks to CPAN Testers for finding
    this consequence of publishing a t/iridium.t that everyone can run.

0.036		2011-04-02	T. R. Wyant
  t/iridium.t no longer requires any extra data for its execution.

  The satpass 'status iridium' command, which has been deprecated for
    quite a while, now issues a warning the first time it is issued. See
    the satpass documentation for the the schedule for its removal.

  Document Astro::Coord::ECI::TLE::Iridium max_mirror_angle attribute.

  Correct export tag documentation in Astro::Coord::ECI::TLE (from
    ':constant' to ':constants').

  Correct the attribute() method on Astro::Coord::ECI,
    Astro::Coord::ECI::TLE, and Astro::Coord::ECI::TLE::Iridium.
    Formerly it was returning false for some extant attributes.

0.035		2011-03-03	T. R. Wyant
  Removed the rightascension attribute in favor of the ascendingnode
    attribute. This is the last step in its deprecation.

  Update the canned Iridium statuses in Astro::Coord::ECI::TLE for the
    taking-out-of-service of Iridium 23. Following Kelso, I have marked
    it spare, rather than failed.

0.034		2010-12-06	T. R. Wyant
  Make code for Astro::Coord::ECI zero-argument ecliptic() less cute
    also, to try to forestall problems.

  Update canned Iridium statuses in Astro::Coord::ECI::TLE, to cover the
    replacement of Iridium 23 (24906) with Iridium 11 (25578) about
    November 3 2010.

  Update and re-enable xt/author/iridium_status.t.

  Try to avoid panic in Astro::Coord::ECI zero-argument geocentric()
    under at least one version by using less-cute code to compute the
    value. The problem could be reproduced using OID 25591 epoch
    30-Nov-2009 05:49:13 (which was over a year old at the time of
    testing).

  This release has known failures in xt/author/iridium_status.t.

0.033		2010-09-17	T. R. Wyant
  Fix glitch in Astro::Coord::ECI::TLE::Iridium flare() where the
    maximum magnitude logic was being called when a flare was not
    possible.

  Add t/sgp4-ver.tle to the distribution, instead of asking people to
    download it. Thanks to Dr. T. S. Kelso.

  Add attribute rcs (radar cross-section) to Astro::Coord::ECI::TLE.
    That class' parse() method will populate the rcs attribute if it
    finds --rcs number on the name line of a NASA-format TLE.

  Require version 5.64 of Exporter, so I don't have to juggle export
    tags for the benefit of early Perls.

  Drop dependency on Params::Util.

  Move author tests from xt/ to xt/author/.

  Make sure POD links specify text.

  Make minimum Perl version 5.6.2, since that is the lowest version I
    have a prayer of supporting.

0.032		2010-07-03	T. R. Wyant
  Have Astro::Coord::ECI::TLE complain every time the rightascension
    attribute is accessed. This is being deprecated in favor of the
    ascendingnode attribute. Elimination is scheduled for the first
    release in 2011.

  Consolidate prerequisites into inc/Astro/Coord/ECI/Meta.pm.

  Don't require Module::Build for configuration when building a
    distribution. This is controlled by environment variable
    MAKING_MODULE_DISTRIBUTION.

  Document that Astro::Coord::ECI::TLE::Iridium will probably not work
    for Iridium Next satellites, to be launched starting about 2015.

  Move acknowledgment of Goran Gasparovic from bin/satpass to
    lib/Astro/Coord/ECI.pm, since that's where the code is and where the
    acknowledgment should have been all along, and so it does not get
    lost when bin/satpass is superseded by App::Satpass2.

  Fix fatal error in satpass when tilde-expanding a non-existent user
    name. It's still an error, just not fatal.

  Tweak the documentation of Astro::Coord::ECI::TLE->is_valid_model(),
    to make it clearer why it was provided, and make it obvious that it
    can be called as a static method.

  Fix bug in precession of equatorial coordinates, which would cause an
    error if no observing station was passed to the subroutine.

  Add Astro::Coord::ECI::TLE method body_type(), which computes the type
    of the body from the common name using an algorithm similar to the
    one documented on Space Track's Satellite Box Score page.

  Weaken recommendation of Time::y2038 when run under Perl 5.12 and
    above, since I really don't think it's needed.

0.031		2010-05-06	T. R. Wyant
  Add the maidenhead() method to Astro::Coord::ECI, to get or set
    geodetic position in the Maidenhead Locator System.

  Update install instructions in README to include cpan, cpanp, or ppi
    as appropriate.

  Add example script eg/passes to download TLEs and predict passes in
    one fell swoop.

  Change the output in the Astro::Coord::ECI::Sun example to UT, and add
    a note why. Thanks to Richard Hardwick for raising this issue.

0.030		2010-02-26	T. R. Wyant
  Update copyright in README to 2010.

  Consolidate all optional module logic, to eliminate duplicate code
    between Makefile.PL and Build.PL, and so the messages all have the
    same 'look and feel.' Dropped XML::Parser from the list, since it
    is no longer used directly by any supported code.

  Add the Heavens Above web site to Astro::Coord::ECI's 'SEE ALSO'.

  Have the satpass script look in $ENV{USERPROFILE} for the
    initialization file, in addition to all the other possibilities.

  Use explicit tolerances for fractional results in the Julian date
    conversion tests in t/basic.t. This is for Strawberry Perl under
    ReactOS 0.3.11, which seems to have a case of the .999999s.

  Trap possible exception from gmtime when generating the sgp4r
    'mean eccentricity < 0 or >= 1' error in Astro::Coord::ECI::TLE.

0.029		2010-02-04	T. R. Wyant
  Date::Manip and Time::y2038 are no longer 'recommended' but 'optional'.
    This means not telling the tool chain about them, but doing custom
    checks, and custom, gentler messages about why you might (or might
    not!) want these modules.

  Centralize the decision about what time routines to use in
    Astro::Coord::ECI::Utils, and have it export to the other modules,
    the tests, the 'satpass' script, and the example scripts.

  Rewrite t/parse_date.t so that it no longer needs Time::y2038.
    Instead, it uses precomputed times, which it offsets for the target
    system's epoch when it runs.

  The above was done in an attempt to clarify the role of the optional
    modules, and cases where they might not be desirable. Thanks to
    Christopher Sylvain for identifying the problems and working with me
    on their solution.

  Rewrite the time portions Astro::Coord::ECI::OVERVIEW to better
    reflect the current state of the time handling. Plus, retitle it so
    that hopefully it will actually appear in the distribution.

0.028		2010-01-11	T. R. Wyant
  Fix bug introduced in 0.027, in which the Astro::Coord::ECI::TLE
    pass() method failed to include the {appulse} data when an appulse
    was found.

0.027		2010-01-08	T. R. Wyant
  Correct (I hope!) the computation of illumination changes in the
    Astro::Coord::ECI::TLE pass() method. The original could miss them
    in the first or last minute of the pass.

  Add exportable constants SPEED_OF_LIGHT (in kilometers per second) and
    SECS_PER_SIDERIAL_DAY to Astro::Coord::ECI::Utils.

  Add attribute frequency (in Hertz) to Astro::Coord::ECI.

  Have the Astro::Coord::ECI->azel() method return Doppler shift as the
    seventh element of the returned array if velocities are available
    AND the frequency attribute is set.

  Attempt to correct the transverse velocities calculated by
    Astro::Coord::ECI->azel() for the rotation of the coordinate system.
    I am not convinced the corrections (or indeed the transverse
    velocities themselves) are correct.

  The first time the Astro::Coord::ECI::TLE rightascension attribute is
    used in a given script, issue a warning that it is deprecated.

  Update copyrights to 2010.

  The Astro::Coord::ECI azel() method now returns velocities if
    these are available. The transverse velocities (azimuthal and
    elevational) are NOT corrected for the Coriolis effect.

  Added Astro::Nova to the Astro::Coord::ECI 'SEE ALSO' section.

  Date::Manip is no longer required. If it is not available, the
    'satpass' script will use a home-grown pseudo-ISO-8601 parser
    instead. The t/parse_time.t test was added to make sure this works
    as advertized.

  Have 'authortest' run the normal tests without any of the optional
    modules. This requires either Test::Without::Module or Devel::Hide.
    If neither is available, 'authortest' will not attempt these tests.

  Remove the last vestiges of the $ENV{DEVELOPER_TEST} machinery.

  Rewrote xt/manifest.t to use Test::More.

  All modules' versions set to 0.026_01. In the future all modules in
    a given release will have the same version number.

  Convert all modules to the CPAN-recommended license.

  Author tests no longer rely on environment variable DEVELOPER_TEST.
    Instead, they are executed by ./Build authortest. This means author
    tests are no longer available via the ExtUtils::MakeMaker build.

  Astro::Coord::ECI:

    * Modify correct_for_refraction() to work down to (and a bit below)
      the horizon setting if that is negative. Thanks to Vidar Tyldum
      Hansen of Kongsberg Satellite Services AS for identifying the
      need for this, and working with me on it.

  satpass:

    * Add the 'refraction' parameter, to allow the user to turn off
      atmospheric refraction (it is on by default).

0.026		2009-10-02	T. R. Wyant
  Astro::Coord::ECI 0.026:

    * Default the {inertial} attribute appropriately.

    * Add the next_azimuth() method to compute when a body passes the
      given azimuth. Thanks to Lixus Zoran for suggesting this on the
      geo-perl mailing list.

  Astro::Coord::ECI::Moon 0.007:

    * Default the {inertial} attribute appropriately.

  Astro::Coord::ECI::Sun 0.010:

    * Default the {inertial} attribute appropriately.

  Astro::Coord::ECI::TLE 0.020:

    * Default the {inertial} attribute appropriately.

    * Deprecate the {rightascension} attribute in favor of the
      {ascendingnode} attribute. See the POD for the
      deprecation plan.

0.025		2009-09-07	T. R. Wyant
  Astro::Coord::ECI 0.035:

    * Correct documentation of matrix math in azel() method.

  Astro::Coord::ECI::TLE 0.019:

    * Add and document validate() method.

    * Make max_effective_date() ignore undef arguments.

    * More verbose message for bad eccentricity in sgp4r.

    * Correct description of synopsis to match what it actually does.

  Astro::Coord::ECI::TLE::Set 0.008:

    * Add and document validate() method.

  bin/satpass 0.024:

    * Add validate command.

  Build.PL:

    * Remove need for Module::Build for configuration, since I also
      supply Makefile.PL.

0.024		2009-08-18	T. R. Wyant
  General:

    * Require Test::More 0.40 for testing.

  Astro::Coord::ECI 0.024:

    * Increment version. No other changes.

  Astro::Coord::ECI::TLE 0.018:

    * Add methods semiminor(), apoapsis(), apogee(), periapsis(), and
      perigee.

    * Add 'effective' attribute, with logic in the parse() method to
      parse Astro::SpaceTrack --effective date out of line 0 of the
      TLE. Thanks to Thomas Wehr for reporting the problem this
      addresses, and T. S. Kelso for explaining what was needed to
      fix it.

    * Add method max_effective_date() to figure out what date to use,
      since things are becoming rather complicated.
    * Add method tle_verbose() to centralize the verbose output of TLE.

  Astro::Coord::ECI::TLE::Set 0.007:

    * Add method max_effective_date() to do the right thing when there
      is more than one TLE to consider.

0.023		2009-03-09	T. R. Wyant
  General:

    * Test t/tle_exception.t is no longer a developer test, but it will be
      skipped unless the user has Time::y2038.

  Astro::Coord::ECI 0.023:

    * Add method equatorial_unreduced(), for those who are only interested
      in range and velocity.

    * Attempt to straighten out velocities when transforming among ECEF,
      ECI, and equatorial. No tests yet, though, so I have no idea if
      it is right. Note that as a consequence of this change it is
      possible to have an object without a velocity, since inertial
      objects no longer default to 0 velocity.

  Astro::Coord::ECI::TLE 0.017:

    * Set Iridium 91 in service in canned status, reflecting updates by
      Rod Sladen and T. S. Kelso. This is the real reason for the
      release; otherwise I would have sat on it until I had velocity
      tests.

0.022		2009-02-15	T. R. Wyant
  General:

    * Make new test t/tle_exception.t a developer test until I can figure
      out why it only runs on my configuration.

0.021		2009-02-13	T. R. Wyant
  General:

    * Make Time::y2038 recommended rather than required, since
      ActivePerl has problems with that module. We use it if
      available, otherwise we fall back to the core modules
      (and Time::Local if needed).

    * Add eg/closest and eg/positions, showing calculation of the
      closest approach to a given point, and standalone calculation
      of the positions of all bodies at a given time.

    * Correct '## no critic' in various places.

  Astro::Coord::ECI 0.021:

    * Trap any exceptions encountered when setting the time, set the time
      to undef (since otherwise we're left in an inconsistent state)
      and re-raise the exception.

  Astro::Coord::ECI::TLE 0.016:

    * Add OID number to exceptions related to orbital elements.

    * Correct error messages involving using a near-earth model on a
      deep-space satellite or vice versa.

    * Document the units of the model results (km or km/sec).

    * Update canned Iridium status for the loss of Iridium 33 in a
      collision with Cosmos 2251.

  Astro::Coord::ECI::TLE::Set 0.006:

    * Tell carp not to report Astro::Coord::ECI (and friends) errors
      as originating in Astro::Coord::ECI::TLE::Set.

  bin/satpass 0.021:

    * Add gmt parameter which, if true, causes time output to be GMT.

    * Trap Astro::Coord::ECI::TLE modeling exceptions in the 'flare',
      'pass', and 'position' commands, so that the whole command does
      not abort when this happens. SIGINT still aborts the whole
      command. Add -quiet option to supress error output.

    * Mark geocode_ca as unsupported and probably not working, since
      they have started requiring registration for use of their
      free port.

  Build.PL:

    * Change check for Astro::SIMBAD::Query to Astro::SIMBAD::Client

  Makefile.PL:

    * Change check for Astro::SIMBAD::Query to Astro::SIMBAD::Client

0.020		2009-01-09	T. R. Wyant
  General:

    * Add Time::y2038 as prerequisite, and use in place of Time::Local and
      CORE gmtime and localtime functions.

    * Add Params::Util 0.25 as prerequisite.

    * Add Astro/Coord/ECI/Overview.pod to try to give a "big picture".

    * Eliminate function calls to UNIVERSAL::can and UNIVERSAL::isa in
      favor of Params::Util::_INSTANCE(), ::_CLASSISA(), or
      Astro::Coord::ECI::Utils::embodies().

    * Update copyright date to 2009.

    * Restructure Build.PL and Makefile.PL to better adapt to the
      installed version.

    * Distribute t/critic.t, t/executable.t, t/iridium_status.t,
      t/manifest.t, and t/perlcriticrc but do not run them unless
      environment variable DEVELOPER_TEST is set.

    * Bring code up to perlcritic --stern with exceptions contained in
      t/perlcriticrc. This was not done to bin/satpass, since I plan to
      retire it.

  Astro::Coord::ECI 0.020:

    * Use represents() rather than isa() on the argument (if any) to the
      equatorial(), next_elevation(), and next_meridian() methods, to
      allow Astro::Coord::ECI::TLE::Set objects.

  Astro::Coord::ECI::Moon 0.006:

    * Make case of 'Moon' in next_quarter() output consistent.

    * Append 'Moon' to first and last quarter description.

    * Add method next_quarter_hash(), which wraps next_quarter() and
      returns a hash similar to the one returned by the
      Astro::Coord::ECI::TLE->pass() method.

    * Add method almanac_hash(), which wraps almanac() in a manner similar
      to next_quarter_hash().

  Astro::Coord::ECI::Star 0.006:

    * Add method almanac_hash(), which wraps almanac() and returns a hash
      similar to the one returned by the Astro::Coord::ECI::TLE->pass()
      method.

  Astro::Coord::ECI::Sun 0.008:

    * Add method next_quarter_hash(), which wraps next_quarter() and
      returns a hash similar to the one returned by the
      Astro::Coord::ECI::TLE->pass() method.

    * Add method almanac_hash(), which wraps almanac() in a manner similar
      to next_quarter_hash().

  Astro::Coord::ECI::TLE::0.015:

    * Add ability to manufacture the 'tle' attribute when the object was
      not generated by the parse() method.

    * Supress object dump when environment variable DEVELOPER_TEST is set.

    * Correct SYNOPSIS to include $tle->set(backdate=>0) with comments.

    * Document models sgp4r and model4r under the 'model' attribute, and
      add them to the DESCRIPTION section of the POD.

  Astro::Coord::ECI::TLE::Iridium 0.007:

    * Document attributes am, day, extinction, and pm.

  Astro::Coord::ECI::TLE::Set 0.005:

    * Add explicit represent() method.

    * Add optional options hash as first argument of aggregate(). The only
      option is {select => $time} which if true causes select($time) to
      be called on any Astro::Coord::ECI::TLE::Set objecgts created.

  Astro::Coord::ECI::TLE::Utils 0.010:

    * Add subroutine embodies($obj, $class) as a safe way to call
      represents() without throwing an exception if $obj is not blessed.

  bin/satpass 0.020:

    * Use Geo::WebService::Elevation::USGS for height().

    * Drop support for SIMBAD 3, since U. Strasbourg did a while back.

    * Trap SOAP errors and correct result hash expansion in height().

    * Eliminate function calls to UNIVERSAL::can and UNIVERSAL::isa.

    * Correct (reverse) documented meaning of flare() options -am, -day,
      and -pm.

    * Document models sgp4r and model4r under the 'model' paramter.

    * Revise 'NOTES' section to cover plans for App::Satpass2, and changes
      for this release.

0.019		2008-10-27	T. R. Wyant
  Astro::Coord::ECI 0.019:

    * Truncate SYNOPSIS code.

    * Range-check angular position input, with warning if out of range:

      - Latitude: - PI/2 <= latitude <= PI/2;

      - Longitude: - 2*PI <= longitude < 2*PI (Jean Meeus' examples
        sometimes use examples outside the conventional range);
      - Right ascension: 0 <= right ascension < 2*PI

  Astro::Coord::ECI::Moon 0.005:

    * Clarify and expand SYNOPSIS code.

  Astro::Coord::ECI::Star 0.005:

    * Correct and expand SYNOPSIS code.

    * Normalize computed right ascension to range 0 to 2 PI.

  Astro::Coord::ECI::Sun 0.007:

    * Clarify and expand SYNOPSIS code.

  Astro::Coord::ECI::TLE 0.014:

    * Clarify and expand SYNOPSIS code.

  Astro::Coord::ECI::TLE::Iridium 0.006:

    * Correct SYNOPSIS code.

    * Document problems with magnitude estimate when the Sun is close
      to the horizon as seen from the satellite.

  Astro::Coord::ECI::TLE::Set 0.004:

    * Clarify and complete SYNOPSIS code.

0.018		2008-10-03	T. R. Wyant
  Astro::Coord::ECI 0.018:

    * Update version number and copyright date. No other changes.

  Astro::Coord::ECI::TLE 0.013:

    * Add semimajor(), to calculate and return the semimajor axis of the
      orbit.

    * Update Iridium status: mark Iridium 28 (OID 24948) failed, and
      Iridium 95 (OID 27375) as in service (was spare).

  bin/satpass 0.018:

    * Under Mac OS X, use Mac::Pasteboard for clipboard operations if
      available; supress pbcopy warning when run as cron job.

    * Fix 'height' query to track changes in USGS' elevation web service.

  t/tle_sgp4r.t:

    * Correct the code that extracts the needed TLEs from the downloaded
      zip file.

0.017		2007-12-30	T. R. Wyant
  Astro::Coord::ECI 0.017:

    * Fall back to homegrown (and un-general, and insufficiently tested)
      code if Storable::dclone not available.

  Astro::Coord::ECI::TLE 0.012:

    * Correct behavior when Scalar::Util::dualvar not present.

  Astro::Coord::ECI::TLE::Iridium 0.005:

    * Use max() and min() from Astro::Coord::ECI::Utils.

  Astro::Coord::ECI::Utils 0.009:

    * Added looks_like_number(), max(), min(), defaulting to the
      Scalar::Util or List::Util implementations if possible, but
      providing our own if not.

    * Clarify load_module() documentation.

  bin/satpass 0.017:

    * Use looks_like_number() and max() from Astro::Coord::ECI::Utils.

    * Recode _load_module to use Astro::Coord::ECI::Utils::load_module.

    * Fix clipboard code to fail gracefully if Scalar::Util::weaken
      is unavailable.

  t/{moon,sun}.t:

    * Skip singleton test if Scalar::Util::refaddr not available.

  t/pod_coverage.t:

    * Correct also_private setting to make it skip all-uppercase+numeric
      (blind fix since mine seems to skip constants anyway, which is
      what I'm really trying to do).

  t/tle.t:

    * Use max() from Astro::Coord::ECI::Utils.

  t/pod_spelling.t 0.010:

    * Add stop words 'max' and 'min'.

  bin/satpass 0.017:

    * Supress '"our" variable $clipboard_unavailable masks earlier
      declaration ...' under 5.10.0.

0.016		2007-12-28	T. R. Wyant
  Astro::Coord::ECI 0.016:

    * Increment version. No other changes.

  Astro::Coord::ECI::TLE 0.011:

    * Use PI-related constants from Astro::Coord::ECI::Utils.

    * pass() no longer throws 'end before beginning' error if caused
      by setting backdate false; instead returns empty list of
      passes.

  Astro::Coord::ECI::TLE::Iridium 0.004:

    * flare() no longer throws 'end before beginning' error if caused
      by setting backdate false; instead returns empty list of
      passes.

    * Add model 'sgp4r', based on 'Revisiting Spacetrack Report #3',
      and equivalent metamodel 'model4r.'

    * Make metamodel 'model' execute sgp4r.

    * Have 'period' take into account which model is being used.

  Build.PL:

    * Prompt for installation of 'satpass' script, defaulting to 'n'.

  Makefile.PL:

    * Fix license support check to work with developer versions of
      ExtUtils::MakeMaker.

    * Prompt for installation of 'satpass' script, defaulting to 'n'.

  bin/satpass 0.016:

    * Document major changes in classes. No other changes.

  eg/tle_period.t:

    * Pseudo-test to compare the various period calculations.

  eg/README:

    * Update to add eg/tle_period.t

  t/{eci,moon,star,sun}.t:

    * Remove dependency on Math::Trig.

    * Prefer Astro::Coord::ECI::Utils over local definitions of
      constants.

  t/iridium.t:

    * Clarify (I hope!) how to run the Iridium tests.

  t/tle_sgp4r.t:

    * New test for model sgp4r. TLEs are not included in the kit,
      but are downloaded if needed.

  t/sgp4r.out:

    * Comparison data for tle_sgp4r.t. Renamed from tforver.out in
      the 'Revisiting Spacetrack Report #3' download.

  t/pod.t:

    * Remove unused variable

  t/pod_coverage.t:

    * Remove unused variable

0.015		2007-11-15	T. R. Wyant
  Astro::Coord::ECI 0.015:

    * Bump version number. No other changes.

  bin/satpass 0.015:

    * Document pod coverage test change, intent to and plans for
      implementing "Revisiting Spacetrack Report #3".

    * Bump version.

  t/pod_coverage.t:

    * Specify all-caps routines as private, since some testers are
      getting failures on 'use constant' declarations. I don't get
      these, so the change is kind of blind.

0.014		2007-11-13
  Astro::Coord::ECI 0.014:

    * Add equinox_dynamical attribute; precess() now uses this as start
      point and leaves the time alone. It is also used when going from
      ECI to ECEF, and set to the current time when going from ECEF to
      ECI.

    * Add global $EQUINOX_TOLERANCE to determine minimum precession when
      converting from ECI to ECEF.

    * Add method equinox_dynamical for performance.

    * Document dynamical and universal times.

    * Add method precess_dynamical() to precess to the given dynamical
      time. The precess() method simply converts its argument to
      dynamical and delegates to this.

  Astro::Coord::ECI::Moon 0.004:

    * Have model set equinox_dynamical attribute to modeled dynamical
      time.

  Astro::Coord::ECI::Star 0.004:

    * Set equinox_dynamical attribute before precessing to current
      equinox.

    * Precess coordinates at end of time_set(), not in middle.

  Astro::Coord::ECI::Sun 0.006:

    * Have model set equinox_dynamical attribute to modeled dynamical
      time.

  Astro::Coord::ECI::TLE 0.010:

    * Add backdate attribute (default: true) to control whether pass()
      uses elements before their epoch.

    * Use the alias() mechanism for special-case settings of the
      illum attribute.

    * Have models set equinox_dynamical to the dynamical epoch.

  Astro::Coord::ECI::TLE::Iridium 0.003:

    * Have backdate attribute control whether flare() uses elements
      before their epoch.

  Astro::Coord::ECI::TLE::Set 0.003:

    * Minor documentation tweaks and POD fixes.

  Astro::Coord::ECI::Utils 0.008:

    * Add constant JD_OF_EPOCH, globals $DATEFORMAT and $JD_GREGORIAN,
      and subroutines date2jd, date2epoch, epoch2datetime, jd2date,
      jd2datetime.

    * Add subroutine load_module and centralize all on-the-fly loading
      here, for support of .pmc modules.

  bin/satpass 0.014:

    * Add 'echo' and 'times' commands.

    * Add 'backdate' parameter, propagate to pass() and flare().

    * Add 'desired_equinox' parameter, use it when displaying inertial
      coordinates (only equatorial, at the moment).

    * Allow pseudo-redirection of command output into a pipe.

0.013		2007-03-02	T. R. Wyant
  Astro::Coord::ECI 0.013:

    * No code changes, but updated version to be visible to CPAN 'r'.

  Astro::Coord::ECI::TLE 0.009:

    * Updated canned Iridium status table for failure of Iridium 36 and
      its replacement by Iridium 97.

  Astro::Coord::ECI::TLE::Iridium 0.002:

    * Fixed occasional borderline-case spurious flare prediction.

  bin/satpass 0.013:

    * Added -version command option, to display preamble and exit.

    * Wrap probe for clipboard helpers in eval{}. Among other things, this
      allows the script to run in taint mode.

    * Add -choose option to list().

    * Allow extra arguments to status show, to do selective status display.

  t/moon.t:

    * Fixed cosmetic undefined value error when Scalar::Util does not
      implement refaddr().

  t/sun.t:

    * Fixed cosmetic undefined value error when Scalar::Util does not
      implement refaddr().

0.012		2007-01-09	T. R. Wyant
  ECI.pm 0.012:

    * Localized $Data::Dumper::Terse

    * Fixed divide-by-zero in azel() when the points coincide.

    * Convert angle() to use law of haversines rather than law of cosines,
      for better performance on small angles.

  ECI/Sun.pm 0.005:

    * Add magnitude() method.

  ECI/TLE.pm 0.008:

    * Add {body} and {station} to hash returned by pass().

    * Add support for reblessing to Astro::Coord::ECI::TLE::Iridium if
      appropriate. This includes rebless(), before_reblessing(),
      after_reblessing(), alias(), can_flare(), status(), and the {reblessable}
      attribute.

  ECI/TLE/Iridium.pm 0.001:

    * Initial release.

  ECI/Utils.pm 0.007:

    * Confess on invalid acos() argument.

    * Add find_first_true() to support finding Iridium flares.

  bin/satpass 0.012:

    * If a source file ends with a continued line, warn and abandon the
      line.

    * Set the time on the appulsing body before obtaining its coordinates.

    * Fix error in end time parser in position().

    * Throw error if doing 'sky lookup' on a body that is already in the
      sky.

    * Have pass() round the displayed time for the appulsing body.

    * Add flare() to calculate Iridium flares.

    * Modify position() to report flare potential for Iridium satellites.

    * Added -choose option to pass(), position(), tle().

    * Removed pass_old() and the timing parameter, strongly deprecated in
      version 0.011.

    * Added {simbad_version} parameter to select SIMBAD software to use.

  eg/iridium 0.001:

    * New example calculating Iridium flares.

0.011		2006-10-26	T. R. Wyant
  ECI.pm 0.011:

    * Add horizon attribute.

  ECI/TLE.pm:

    * Add pass() method and supporting attributes.

  bin/satpass:

    * Add check_version()

    * Defer loading of optional modules to speed startup.

    * Rewrite XML parsing to use either XML::Parser or XML::Parser::Lite,
      with XML::Parser being preferred.

    * Fix fatal error when running off the end of the top-level command
      script.

    * Support ~user in filenames.

    * Convert pass() to use Astro::Coord::ECI::TLE->pass(). Old code
      remains as pass_old(), strongly deprecated.

    * Use Time::HiRes for timing, if that is available.

    * Document status of pass_old, 'timing' parameter (strongly
      deprecated) and the SIMBAD situation.

  eg/iss:

    * New example to demonstrate Astro::Coord::ECI::TLE->pass().

0.010		2006-09-23	T. R. Wyant
  ECI.pm 0.010:

    * Check for null arguments on most calls, so we die now rather
        than later.
    * Fix undefined value when calling set() with no arguments.

  ECI/Moon.pm 0.003:

    * Make singleton object by default.

  ECI/Sun.pm 0.004:

    * Make singleton object by default.

  bin/satpass 0.010:

    * Add qualifiers -brief, -list, and -delete to macro command.
        Parameter explicit_macro_delete controls what the macro
        command does when given a name but no definition.

    * Make -time work on macros and source commands.

    * Add ability to abort macros and source scripts on error,
        controlled by parameter error_out.

  Build.PL:

    * Correct add_to_cleanup() call.

    * Add omitted ECI/Sun.pm.

  Makefile.PL:

    * Add explicit PL_FILES => {}, to prevent old versions from
        trying to execute 'perl Build.PL Build'.

0.009		2006-07-23	T. R. Wyant
  ECI.pm 0.009:

    * Add represents() method.

  ECI/Sun.pm 0.003:

    * Remove redundant definition of ASTRONOMICAL_UNIT; use AU from
        Astro::Coord::ECI::Utils

  ECI/TLE.pm 0.006:

    * Add is_model_attribute(), is_valid_model().

  ECI/TLE/Set.pm 0.002:

    * Allow Astro::Coord::ECI::TLE::Set objects as arguments of add().

    * Take advantage of is_model_attribuite(), is_valid_model().

  bin/satpass 0.009:

    * Fix defaulting of second argument of quarters().

    * Allow macros to override core commands. Macros can no longer
        call themselves, and core commands can be accessed explicitly
        by the syntax core.command.

    * Relative times for the second and subsequent arguments of a
        command are relative to previous time argument of the same
        command, whether absolute or relative.

  Build.PL 0.001:

    * Initial version.

0.008		2006-07-14	T. R. Wyant
  ECI.pm 0.008:

    * Support the use of Astro::Coord::ECI::TLE::Set objects in the
        angle() method.

    * Add method attribute().

  ECI/TLE.pm 0.005:

    * Add the null model.

  ECI/TLE/Set.pm 0.001 - New container object.

  ECI/Utils.pm 0.006:

    * Add dynamical_delta() method (was private method in ECI.pm).

  bin/satpass 0.008:

    * Use Astro::Coord::ECI::TLE::Set objects to represent satellites
        when we have more than one set of orbital elements.

    * Add help for Astro::Coord::ECI::TLE::Set.

    * Add and document 'singleton' parameter. Use it in pass() and
        position().

    * Default end times relative to start times, rather than relative
        to the last explicit time.

    * Fix interaction between clipboard functionality and test hook.
        Thanks to IMACAT for help diagnosing and verifying.

    * Add acknowledgments.

0.007		2006-07-06	T. R. Wyant
  ECI.pm:

    * Optimize, mostly by being smarter about when to clear cached
      coordinates.

    * Correct spelling in POD.

  ECI/Moon.pm:

    * Change die to confess on programming error.

    * Correct spelling in POD.

  ECI/Star.pm:

    * Correct spelling in POD.

  ECI/Sun.pm:

    * Correct spelling in POD.

  ECI/TLE.pm:

    * Modify internals for easier cache clearing.

    * Better documentation of 'mean anomaly'.

    * Correct spelling in POD.

    * Trap invalid effective eccentricity in sgp4. The underlying cause
      of the problem is probably either an invalid TLE or using the TLE
      past its 'good until' date.

  ECI/Utils.pm:

    * Change die to confess on programming error.

    * Correct spelling in POD.

  Makefile.PL:

    * Get rid of wrong-headed attempt to configure optional modules.

  bin/satpass:

    * Various documentation corrections.

    * Correct spelling in POD.

    * Add store() and retrieve() as interface to Storable.

    * Centralize tilde expansion, and do it on cd(), load(), retrieve (),
      source(), store ().

    * Preprocess -start and -end options of st(), to make dates
      consistent with the rest of satpass.

    * Add -initialization_file command option.

    * Add -optional option on source().

    * Add localize(), and macro/source call frames to support this.

    * Add localize subcommand to st().

    * Make 'st show' a synonym for 'st get', and make 'st get' without
      arguments show all settings.

    * Add test hooks, and a test to exercise the more arcane functions
      of the script.

    * Add -source_layer and -retry_on_zero options to height_us().

    * Add a separate height_ca() method that makes use of the above
      options when delegating to height_us(), in response to anomalous
      responses to height queries.

    * Fix problem displaying appulses in pass().

    * Make the position() display positions for a range of times. Add
      -realtime option to position() to display positions in
      near-real-time.

    * Add drop().

    * Fix formatting of error messages from the local coordinate
      formatters.

    * Have position() display epoch and illumination when displaying
      objects from the observing list.

0.006		2006-06-07	T. R. Wyant
  ECI.pm:

    * Cache some calculations for re-use.

  ECI/Star.pm:

    * Tweak docs.

  ECI/Utils.pm:

    * Add intensity_to_magnitude(), atmospheric_extinction().

  bin/satpass:

    * Correct check for whether location has been set. Old check
      did not recognize 0 latitude, longitude, or height.

    * Special-case code to 'unset' tz when it is set to undef or ''.

    * Make 'position' iterate over time, in real time with -realtime.

    * Add -time global command option to time execution.

    * Add 'country' parameter. Break out 'geocode' and 'height' to
      country-specific versions, and make the original command
      dispatch based on 'country' parameter or explicit argument.

    * Allow formatting of local coordinates without range information.

    * Round pass times to the nearest second (since strftime truncates).

    * Add 'almanac' command options -horizon, -quarters, -transit, and
      -twilight to restrict the output.

    * Make height_us() work with revised USGS SOAP calling sequence.

0.005		2006-04-21	T. R. Wyant
  ECI.pm:

    * Add 'inertial' read-only attribute.

    * Add equatorial coordinates relative to observer.

    * Fix negative right ascension - should be mod 2 pi.

    * Tweak docs, including fuller synopsis.

  bin/satpass:

    * Add local_coord parameter to determine local coordinate system
      (azel or equatorial).

    * Modify pass and position output to use local_coord.

  TLE.pm:

    * Tweak synopsis, to show that setting time runs model.

0.004		2006-03-14	T. R. Wyant
  bin/satpass:

    * Rewrite command parsing so that we can retain quotes and
      be POSIXly correct in option processing for the system
      command.

    * Give tle command a -verbose qualifier, to produce a formatted
      listing of the orbital parameters.

    * Provide HTML =item targets consistent with links.

  ECI.pm:

    * Clean up docs.

  TLE.pm:

    * Clean up docs, wrap some really long lines.

    * Replace _fmod2p with mod2pi from Utils module.

0.003		2006-03-10	T. R. Wyant
  bin/satpass:

    * Remove all uses of Clipboard, to try to get built under
      ActiveState's ActivePerl.

    * Correct version number in Astro::SpaceTrack load.

    * Accumulate Iridium operational statuses.

    * Add status command to display satellite operational status.

  Astro::Coord::ECI:

    * Increment version, as a lazy way to increment the distribution
      version.

    * Tweak documentation.

  Astro::Coord::ECI::Utils:

    * Make subclass of Exporter, since ActiveState's build
      seems to have a problem with 'use Exporter qw{import}'
      (except under darwin, strangely enough).

    * Increment version.

0.002		2006-03-02	T. R. Wyant
  bin/satpass:
    * Behave better when no Clipboard module.

    * Do not use Clipboard module under darwin.

    * Require Astro::SpaceTrack 0.016 (if any).

    * Default star distance now 10000 parsecs (was 1 parsec).

    * Add 'sky lookup', using Astro::SIMBAD::Query.

    * Modified 'sky' listing format to look like 'sky add' commands.

  Astro::Coord::ECI:

    * Add NAD83 ellipsoid.

  Astro::Coord::ECI::Utils:

    * Corrected documentation.

0.001		2006-02-17	T. R. Wyant
  Initial release
