#constellations

The 88 modern IAU constellations as an API — the reference an astronomy app, planetarium or education tool needs. For each constellation: its official IAU abbreviation, English name, the Latin genitive used when naming stars (e.g. "Alpha Andromedae"), a size rank, the approximate centre in equatorial coordinates (right ascension / declination) and the constellation name in roughly 25 languages. Look one up by abbreviation or name, search across every language, find which constellation a sky position falls nearest to, or list them all. Distinct from stars-api (individual stars) — this is the reference for the constellations themselves. Served from memory — always fast.

api.oanor.com/constellations-api

A catalogue of 9,000+ stars — every named star plus all naked-eye stars to magnitude 6.5 — from the HYG database. Look up a star by name, search and filter by constellation and brightness, list the brightest stars (overall or per constellation), and browse all 88 constellations. Each star includes its constellation, apparent and absolute magnitude, spectral class, distance in light-years and coordinates. Great for astronomy, education and stargazing apps.

api.oanor.com/stars-api