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- Update to 1.39
  * The Angle.dstr() and Angle.hstr() methods now accept a
    format= argument that lets callers override Skyfield’s default
    angle formatting and supply their own; see Formatting angles.
    #513
  * The prototype planetary_magnitude() function now works not
    only when given a single position, but when given a vector of
    several positions.
- Release 1.38
  * Replaced the old historic ∆T table from the United States
    Naval Observatory with up-to-date splines from the 2020 release
    of the extensive research by Morrison, Stephenson, Hohenkerk,
    and Zawilski and also adjusted the slope of Skyfield’s
    near-future ∆T estimates to make the slope of ∆T much less
    abrupt over the coming century.
  * Added a full reference frame object for the TEME reference
    frame used by SGP4 Earth satellite elements.
- Release 1.37
  * Added a frame_latlon_and_rates() method that can compute the
    rates at which angles like altitude and azimuth, or right
    ascension and declination, are changing.
  * Accepted a contributor’s helpful fix for a rounding error that
    had slightly shifted a few constellation boundaries. #548
  * The Time tuple utc and method utc_strftime() are now backed by
    the same math, so they always advance to the next calendar day
    at the same moment. This makes it safe to mix values returned
    by one of them with values returned by the other. #542
  * Vector subtraction now returns the position subclass specific
    to the resulting vector’s center. #549
- Release 1.36

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- Fix boo#1182424: Use https url of the Hipparcos catalog

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- Update to 1.35
  * Deprecated the old Topos class, which not only featured
    a clunky interface but hid from users the fact that
    Skyfield was generating IERS2010 positions from latitude
    and longitude when in fact nearly all users want WGS84
    positions. Users are now encouraged to supply latitude
    and longitude to the
    :meth:`~skyfield.toposlib.Geoid.latlon()` method of
    either the :data:`~skyfield.toposlib.wgs84` object or the
    :data:`~skyfield.toposlib.iers2010` object. Related
    discussion: #372
  * The two new geoid objects
    :data:`~skyfield.toposlib.wgs84` and
    :data:`~skyfield.toposlib.iers2010` have also provided a
    happy new home for the
    :meth:`~skyfield.toposlib.Geoid.subpoint()` method —
    which was previously stranded over on the
    :class:`~skyfield.positionlib.Geocentric` class, where it
    couldn’t be used with positions of other classes that
    might be centered at the geocenter. (The old method will
    remain in place to support legacy code, but is
    discouraged in new applications.)
  * The effects of :ref:`Polar motion` — if configured —
    are now included both when computing the position in
    space of an Earth latitude and longitude, and when
    determining the latitude and longitude beneath a
    celestial position.
  * Added :func:`~skyfield.api.load_constellation_names()`.
  * The :meth:`~skyfield.timelib.Time.utc_jpl()` method now
    correctly designates its return value as UTC instead of

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- Update to v1.34
  * The position classes have gained methods frame_xyz(), 
    frame_xyz_and_velocity(), frame_latlon(), and 
    from_time_and_frame_vectors() that work with a new 
    library skyfield.framelib to offer a number of familiar 
    reference frames. These replace the existing ad-hoc 
    position methods for ecliptic and galactic coordinates, 
    which are now deprecated (but will continue to be 
    supported). See Coordinates in other reference frames.
  * Added support for IERS Polar Motion 𝑥 and 𝑦.
  * Added a method lst_hours_at() that computes Local 
    Sidereal Time.
  * A new almanac routine moon_phase() returns the Moon 
    phase as an angle where 0° is New Moon, 90° is First 
    Quarter, 180° is Full, and 270° is Last Quarter. #282
  * Almanac search routines that previously returned a 
    Boolean true/false array now return an integer 0/1 
    array instead, to work around a new deprecation warning 
    in NumPy which, for example, would have outlawed using 
    the Boolean array from moon_nodes() to index into the 
    MOON_NODES list that provides a name for each node. #486
  * The undocumented columns magnitude_H and magnitude_G 
    in the Minor Planet Center comets dataframe have been 
    renamed magnitude_g and magnitude_k following further 
    research on the file format (which does not itself 
    document which magnitude model is intended). #416
- add finals2000A.all to testdata

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- Define skip_python36 for TW, because current astropy needs
  Python >=3.7

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- Update to v1.33
  * Fix: running ``load.timescale(builtin=False)`` was raising an
    exception ``FileNotFoundError`` if the ``finals2000A.all`` file was
    not already on disk, instead of downloading the file automatically.
    `#477 <https://github.com/skyfielders/python-skyfield/issues/477>`_
- v1.32
  * A new :func:`~skyfield.eclipselib.lunar_eclipses()` routine finds
    lunar eclipses and determines their degree of totality.
    `#445 <https://github.com/skyfielders/python-skyfield/issues/445>`_
  * The almanac module’s new :func:`~skyfield.almanac.meridian_transits()`
    routine can find the moments at which a body transits the meridian and
    antimeridian.
    `#460 <https://github.com/skyfielders/python-skyfield/issues/460>`_
* Fix: the :func:`~skyfield.searchlib.find_minima()` function was
  ignoring its ``epsilon`` and ``num`` arguments and always using the
  default values instead.
  `#475 <https://github.com/skyfielders/python-skyfield/pull/475>`_
* Fix: the ``.epoch`` attribute of Earth satellite objects that were
  built using :meth:`~skyfield.sgp4lib.EarthSatellite.from_satrec()`
  was, alas, a half-day off.
  `#466 <https://github.com/skyfielders/python-skyfield/issues/466>`_
* Fix: the :class:`~skyfield.toposlib.Topos` constructor arguments ``x``
  and ``y``, which never worked properly, have been deprecated and are
  now ignored.
1.31 — 2020 October 24
----------------------
* Skyfield now uses the International Earth Rotation Service (IERS) file
  ``finals2000A.all`` for updated ∆T and leap seconds.  The USNO is no
  longer updating the files ``deltat.data`` and ``deltat.preds`` that
  previous versions of Skyfield used, and the ``cddis.nasa.gov`` server
  from which they were fetched will discontinue anonymous FTP on 2020
  October 31.  See `downloading-timescale-files`.
  `#452 <https://github.com/skyfielders/python-skyfield/issues/452>`_
  `#464 <https://github.com/skyfielders/python-skyfield/issues/464>`_
* The comets dataframe built from the MPC file ``CometEls.txt`` now
  includes the ``reference`` column, so users can tell which orbit is
  most recent if there are several orbits for a single comet.  (For
  example, the file currently lists two C/2020 F3 (NEOWISE) orbits.)
  The comet examples in the documentation now build a dataframe that
  only includes the most recent orbit for each comet.
  `#463 <https://github.com/skyfielders/python-skyfield/issues/463>`_
* Two new methods :meth:`~skyfield.iokit.Loader.days_old()` and
  :meth:`~skyfield.iokit.Loader.download()` make it simple to download a
  fresh copy of a file if the copy on disk is older than you would like.
1.30 — 2020 October 11
----------------------
* The various ``strftime()`` Skyfield methods now support the ``%j``
  day-of-year format code.
* Fix: the new Julian calendar support broke support for out-of-range
  month numbers, wrapping them into the current year instead of letting
  them overflow into subsequent years.
  `#461 <https://github.com/skyfielders/python-skyfield/issues/461>`_
* Fix: a stray debugging ``print()`` statement was stranded in ``t.dut1``.
  `#455 <https://github.com/skyfielders/python-skyfield/issues/455>`_
* The :class:`~skyfield.timelib.Time` object, if manually instantiated
  without a Julian date fraction, now provides a fraction array with
  dimensions that match the Julian date argument.
  `#458 <https://github.com/skyfielders/python-skyfield/issues/458>`_ 

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- Update to version 1.29
  * Fix: the new Julian calendar feature was raising an 
    exception in the calendar methods like 
    `skyfield.timelib.Time.tt_calendar()` if the time 
    object was in fact an array of times. #450
  * Fix: trying to iterate over a time object would raise an 
    exception if the time was created through 
    `~skyfield.timelib.Timescale.ut1()`.
- Version 1.28
  * Broken URL: Because the VizieR archive apparently decided 
    to uncompress their copy of the hip_main.dat.gz Hipparcos 
    catalog file, the old URL now returns a 404 error. As an 
    emergency fix, this version of Skyfield switches to their 
    uncompressed hip_main.dat. Hopefully they don’t compress 
    it again and break the new URL! A more permanent solution 
    is discussed at: #454
  * To unblock this release, removed a few deprecated pre-1.0 
    experiments from April 2015 in skyfield.hipparcos and 
    skyfield.named_stars that broke because the Hipparcos 
    catalog is no longer compressed; hopefully no one was 
    using them.
  * In a sweeping internal change, the 
    `~skyfield.timelib.Timescale` and 
    `~skyfield.timelib.Time` objects now offer support 
    for the Julian calendar that’s used by historians for 
    dates preceding the adoption of the Gregorian calendar in 
    1582. See choice of calendars if you want to turn on 
    Julian dates in your application. #450

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- Update to version 1.27
  * The printed appearance of both vectors and of vector 
    functions like Earth locations and Earth satellites 
    have been rewritten to be more informative and 
    consistent.
  * Added compute_calendar_date() which lets the caller 
    choose the Julian calendar for ancient dates instead of 
    always using the proleptic Gregorian calendar. This 
    should be particularly useful for historians.
  * Added J() that builds a time array from an array of 
    floating point years. #436
  * Added four new strftime methods for the non-UTC 
    timescales (#443). All four of them support %f for 
    microseconds, and provide a reasonable default format 
    string for callers who don’t wish to concoct their own:
      tai_strftime()
      tt_strftime()
      tdb_strftime()
      ut1_strftime() 
  * Thanks to several fixes, comets and asteroids with 
    parabolic and hyperbolic orbits should now raise fewer 
    errors.
 *  The prototype planetary_magnitude() can now return 
    magnitudes for Uranus without raising an exception. The 
    routine does not yet take into account whether the 
    observer is facing the equator or poles of Uranus, so 
    the magnitude predicted for the planet will only be 
    accurate to within about 0.1 magnitudes.

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- Update assay to commit 256.23c18c2 in order to fix non x86 builds

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- Update assay to commit 255.f443e61 in order to fix non x86 builds

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