Free read-only API

Everything the Atlas caches, as JSON. No keys, no signup. Cached data only: we never proxy live upstream services.

Highlights

/api/v1/tonight: computed Moon phase + planet visibility, right now
/api/v1/exoplanets?view=closest&limit=100: the confirmed-exoplanet catalog (views: closest, earthlike, largest, hottest, newest)
/api/v1/objects?kind=moon and /api/v1/object/europa: curated guides with sourced facts
/api/v1/launches: upcoming launches (cached daily)
/api/v1/showers, /api/v1/events: meteor showers and the eclipse almanac
/api/v1/constellations, /api/v1/glossary, /api/v1/concepts, /api/v1/timeline, /api/v1/people, /api/v1/news

Rules of the road

Responses carry attribution and a disclaimer in their meta block. Keep them when you republish. Sources that must be credited downstream: NASA Exoplanet Archive, The Space Devs, D3-Celestial/HYG. Please cache on your side (responses are already CDN-cacheable, 5-minute headers) and be gentle; this is an educational service.