- Update to 1.46:
  * The :func:`~skyfield.almanac.oppositions_conjunctions()` routine
    now measures ecliptic longitude using the ecliptic of each
    specific date, rather than always using the J2000 ecliptic,
    which should improve its accuracy by several seconds.
  * Skyfield’s internal table for the ∆T Earth orientation parameter
    has been updated, so that its predictions now extend to 2024-04-13.
  * Bugfix: Skyfield was giving values several kilometers off
    when computing the elevation above ground level of a target that
    was positioned directly above the Earth’s north or south pole.
  * Bugfix: the function skyfield.positionlib.ICRF.is_behind_earth() 
    method was incorrectly returning True if the Earth was on the
    line that joins the two satellites, but over on the far side of
    the other satellite where it wasn’t really in the way.
  * The method skyfield.positionlib.ICRF.altaz() now lives on the
    main position class instead of in two specific subclasses.
    If the user mistakenly tries to call .altaz() on an instance
    of the skyfield.positionlib.Astrometric position
    subclass - which previously lacked the method - then a friendly
    exception is raised explaining their error.

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