- 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