Honoring Contributors

Gratitude & Acknowledgments

Celestia stands on the shoulders of astronomers, mathematicians, open-source engineers, and artists who freely share their work with humanity. We extend our deepest gratitude to all contributors.

Space Science & Astronomical Data

National Aeronautics and Space Administration

NASA Open APIs & APOD

Daily astronomical imagery, planetary photography, and cosmic astrophysics metadata.

Curated by Robert Nemiroff (MTU) and Jerry Bonnell (UMCP). NASA imagery is within the public domain in accordance with NASA media guidelines.

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Astrodienst AG (Dieter Koch & Alois Treindl)

Swiss Ephemeris

High-precision planetary ephemeris algorithms and Keplerian orbital computation.

Based on the Jet Propulsion Laboratory (JPL) DE431 and DE406 planetary integrations. Swiss Ephemeris is a registered trademark of Astrodienst AG.

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Sunrise-Sunset.org

Sunrise-Sunset API

Solar noon, twilight boundaries, day length, and local horizon transitions.

Free REST API utilizing astronomical algorithms for calculating solar positions across geographic coordinates.

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Jean Meeus

Astronomical Algorithms

Foundational celestial mathematics for Julian Day calculations and sidereal time.

Mathematical reference algorithms for spherical astronomy and planetary coordinates.

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Open-Source Frameworks & Libraries

Astro

MIT License
Astro Core Team & Community

Component islands architecture, zero-JS baseline, and high-speed static site generation.

GSAP (GreenSock)

Standard GreenSock License
GreenSock, Inc.

High-performance starlight canvas simulations, inertial mouse parallax, and timeline transitions.

Tailwind CSS v4

MIT License
Tailwind Labs Inc. (Adam Wathan)

Modern CSS theme engine, dynamic color tokens, and responsive utility styling.

Cloudflare

Cloudflare Workers & Pages Platform
Cloudflare, Inc.

Global edge network delivery, zero-latency serverless routing, and immutable asset caching.

TypeScript

Apache 2.0 License
Microsoft Corporation

Strict type safety, astronomical data structures, and coordinate transform validation.

Phosphor Icons

MIT License
Helena Zhang & Tobias Fried

Clean, flexible icon family designed for modern digital user interfaces.

Typography & Vector Artistry

Cormorant Garamond

SIL Open Font License 1.1
Christian Thalmann (Catharsis Fonts)

Display serif typography, celestial headings, and astrological house markers.

Plus Jakarta Sans

SIL Open Font License 1.1
Tokotype (Gumpita Rahayu)

Interface sans-serif typography, coordinate readouts, and scientific data tables.

Legal Notice & Disclaimers

Non-Affiliation: Celestia is an independent educational and cultural exploration platform. It is not affiliated with, endorsed by, or sponsored by NASA, the Jet Propulsion Laboratory, or the United States Government. NASA and the NASA insignia are registered trademarks of the National Aeronautics and Space Administration.

Astrology & Cultural Context: Astrological charts, zodiac archetype metrics, and planetary house calculations are provided for cultural, educational, historical, and self-reflective enjoyment. They do not constitute professional, financial, medical, or legal advice.

Open-Source Compliance: All open-source packages, fonts, and data endpoints used across this application are integrated strictly in accordance with their respective open-source licenses (MIT, Apache 2.0, SIL Open Font License, and NASA Public Domain terms).