Ellipsoids

[aelanman]

Switch to using ellipsoid models in defining selenodetic coordinates. Ellipsoids are called "selenoids" in analogy with "geoids".

Updates some tests accordingly. This is needed for corresponding changes in pyuvdata.

[codecov]

Codecov Report

Attention: Patch coverage is 96.22642% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 86.48%. Comparing base (4be9e04) to head (172a77a).
Report is 2 commits behind head on main.

Files	Patch %	Lines
lunarsky/moon.py	95.74%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #26      +/-   ##
==========================================
- Coverage   86.64%   86.48%   -0.17%     
==========================================
  Files           7        8       +1     
  Lines         584      614      +30     
==========================================
+ Hits          506      531      +25     
- Misses         78       83       +5     

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[bhazelton]

This looks great, thank you so much! The only thing I wondered is if you want to add testing against python 3.12.