- 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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