Imagery
- Planet, Moon, Sun and Milky Way textures by Solar System Scope, licensed under CC BY 4.0, based on NASA mission data. Textures were resized and recompressed for the web.
- NASA Astronomy Picture of the Day images are credited individually; copyrighted entries are linked rather than displayed.
Data
See the full list on the data sources page: NASA/JPL, NASA Goddard, the NASA Exoplanet Archive (Caltech/IPAC), The Space Devs, the Spaceflight News API, wheretheiss.at and the International Meteor Organization.
Open-source software
- Next.js and React (MIT)
- three.js, React Three Fiber and Drei (MIT)
- Tailwind CSS (MIT) and Lucide icons (ISC)
- Fonts: Unbounded, Inter and JetBrains Mono (SIL Open Font License), self-hosted via next/font
Scientific references
Formulas follow standard references including Curtis, Orbital Mechanics for Engineering Students; Mandel & Agol (2002); Seager & Mallén-Ornelas (2003); and Kopparapu et al. (2014). Each calculator lists its own references.
Last updated 2026-10-23.