Free to use

All star maps, charts and PDFs on Atlas of the Sky are published under the Creative Commons Attribution 4.0 license (CC BY 4.0). You can download, print, share and adapt them, including in books, classes, presentations, apps and websites, and for commercial purposes, as long as you credit the source.

How to credit

Below the image or in your list of sources:

Atlas of the Sky (constellationmap.org), CC BY 4.0

On a website, please link to the page the image comes from.

Data and their licenses

• Yale Bright Star Catalogue, 5th revised ed. (Hoffleit & Warren 1991), distributed by NASA HEASARC and the CDS.
• Constellation boundaries: IAU (Delporte 1930), digital data by A. C. Davenhall & S. K. Leggett (1989, CDS catalog VI/49), with corrections by B. Gray.
• Constellation lines: Marc van der Sluys, ConstellationLines, CC BY 4.0.
• Star names: IAU Catalog of Star Names (WGSN), IAU material under CC BY 4.0.
• Messier objects, distances and names in other languages: Wikidata, CC0.
• Fonts in the images: Fira Sans (SIL Open Font License 1.1).