This is the canonical Python library for astronomical data analysis, and if you're doing anything with celestial coordinates, FITS files, or cosmological calculations, you'll need it. The skill gives Claude fluency with the whole stack: transforming between coordinate systems like ICRS and Galactic, handling physical units and quantities with proper conversions, reading and writing FITS headers and data, computing cosmological distances at different redshifts, and managing precise time scales for observations. The references cover the tricky bits like WCS transformations and coordinate matching that trip people up. It's comprehensive without being academic about it, treating Astropy as the practical toolkit it is rather than trying to explain astrophysics.
npx skills add https://github.com/k-dense-ai/scientific-agent-skills --skill astropy