# astropy.coordinates — Reference

This file is a placeholder for the extended `astropy.coordinates` reference promised in the skill workflow.

For detailed coordinate frame descriptions, transformations, observer-dependent frames (AltAz), catalog matching, and performance tips, see the upstream astropy docs:

- https://docs.astropy.org/en/stable/coordinates/
- https://docs.astropy.org/en/stable/coordinates/frames.html
- https://docs.astropy.org/en/stable/coordinates/matchsep.html