Dominique Leuenberger
b4d6a35a6d
- Update to 1.54
* Skyfield’s internal table for the ∆T Earth orientation
parameter has been updated, so observations extend to this
month and predictions to January 2027. Compared to the previous
version of Skyfield, this changes the Earth’s rotation angle by
up to 0.2 arcseconds in 2025 and 1.1 arcseconds in 2026.
* The apparent() method now accepts an optional deflectors=
argument that lets callers control the list of bodies (by
default the Sun, Jupiter, and Saturn) for which the deflection
of light is computed. Callers can provide an empty list to turn
deflection off.
* The two routines find_risings() and find_settings() now skip
deflection when computing the target’s apparent position, which
increases their speed by around 30%. The routines aim for only
millisecond precision, while deflection only makes a difference
of microseconds.
* You can now subtract a NumPy array of floating point TT days
from a Skyfield Time object of the same length; previously,
only a plain int or float was supported as the subtrahend.
* Bugfix: the apparent() method in previous Skyfield versions was
using the wrong coordinates for Earth’s center when computing
how Earth’s gravity deflects positions for topocentric
observers. This has been fixed, and Skyfield’s test suite shows
that agreement with the Naval Observatory’s high-precision
NOVAS library has improved from 0.5 mas to 0.01 mas for
topocentric positions. (Astrometric positions were already
agreeing at the 0.01 mas level.)
- Skyfield v1.53
* Fix: calling observe() on a position generated by an ephemeris
with multiple segments per target, like DE441, was raising an
OBS-URL: https://build.opensuse.org/request/show/1349121
OBS-URL: https://build.opensuse.org/package/show/openSUSE:Factory/python-skyfield?expand=0&rev=22