Licences & Credits

Astronomical Data Sources

HYG Star Database v3.8

• Author: David Nash (AstroNexus)
• Licence: CC BY-SA 2.0
• Source: astronexus.com
• Usage: Star catalogue data (position, brightness, spectral type)
• Modifications: Data processed and adapted for app use

ConstellationLines

• Author: Marc van der Sluys
• Licence: CC BY 4.0
• Usage: Constellation connection lines
• Modifications: Data processed and adapted for app use

Messier Catalogue

• Licence: Public Domain
• Usage: Astronomical object data (110 deep-sky objects)

Caldwell Catalogue

• Licence: Public Domain
• Usage: Astronomical object data (109 deep-sky objects)

JPL DE440 Ephemeris

• Author: NASA / Jet Propulsion Laboratory
• Licence: NASA Open Data (Public Domain)
• Source: ssd.jpl.nasa.gov
• Usage: Calculation of planetary positions