Sources & licences
Your chart is made from real catalogue stars and deterministic calculations. No AI-generated stars or Stellarium source code are used.
Astronomy & star positions
Astronomy Engine (MIT) calculates time-dependent positions. The adapted AT-HYG catalogue by David Nash / Astronexus (CC BY-SA 4.0) supplies star positions, brightness and proper motion. Selected reference cases are checked independently against Skyfield/JPL and Stellarium.
Design, places & Earth
Constellation figures: Olaf Frohn / d3-celestial (BSD). Fonts: Atkinson Hyperlegible and Cormorant Garamond (SIL Open Font License). Place centres and timezones: GeoNames (CC BY 4.0). Geographic outlines: Natural Earth (public domain).
Your chart licence
The sky illustration and our artwork contributions use CC BY-SA 4.0. You can print, share, adapt and commercially redistribute them with attribution and share-alike conditions. Private customer text and brand rights remain separate.
Read the complete chart licence ↗