Bump skyfield from 1.54 to 1.55

[dependabot]

Bumps skyfield from 1.54 to 1.55.

Changelog

Sourced from skyfield's changelog.

v1.55 — 2026 August 7

• The Stellarium project has adopted a new file format for storing constellation lines, so Skyfield has gained a new function :func:~skyfield.data.stellarium.parse_constellations_json() and the example script :ref:neowise-chart in Skyfield’s documentation has been updated to use it.

• A new GM\ :sub:☉ constant is available for use with Kepler orbits. It’s named GM_SUN_DE440_km3_s2 and uses the value published with the DE440 ephemeris. The difference between it and the older constant GM_SUN_Pitjeva_2005_km3_s2 is probably too small to make any practical difference — they differ by a proportion of only about 5.4×10\ :sup:−12 — but because the newer constant’s name is easier to read and type, the Kepler documentation has been tweaked to use it instead.

• Fix: if :func:~skyfield.almanac.find_risings() or :func:~skyfield.almanac.find_settings() converged too quickly on the exact time of rising or setting, then they would print a RuntimeWarning: invalid value encountered in divide and return a NaN value instead of a time. [#1140](https://github.com/brandon-rhodes/python-skyfield/issues/1140) <https://github.com/skyfielders/python-skyfield/issues/1140>_

• Skyfield’s refraction logic should no longer trigger the recent NumPy FutureWarning about the changes that NumPy is planning to make to np.bool.

Commits

• 8e8eb20 Declare version 1.55
• 1d42bae CI: add Stellarium file, so no download is needed
• db99f0e Switch to new Stellarium constellation file format
• 292212e Add GM Sun from ephemeris DE440 as a constant
• b6579fd Fix almanac inner function docstring (#1134)
• 771bb29 Fix 0/0 = NaN in the rise/set parabola fit (#1140)
• 40c6e6c Docs: reword intro to Planetary Reference Frames
• 7dfae00 Docs: for #1121 explain where position came from
• 127a730 Silence recent NumPy warning about np.bool
• f598772 Fix: refract() on array should return same angles
• Additional commits viewable in compare view

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