Dev Tools · 1h ago
Zero-dependency TypeScript library computes Sun/Moon positions with arcsecond accuracy
Developer shipped grahan v0.1.0, an MIT-licensed TypeScript library for astronomical calculations including Sun/Moon positions, sunrise/sunset, and Vedic panchang. It achieves 4.6 arcsecond accuracy for Sun longitude using public-domain algorithms from Meeus and VSOP87. The library has zero runtime dependencies and runs in Node 18+, browsers, and edge runtimes.
Meridian48 take
A well-documented, auditable alternative to AGPL ephemeris libraries, but its niche Vedic calendar features may limit mainstream adoption.
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I built a zero-dependency sky engine in TypeScript, verified to 4.6 arcseconds →
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typescript-libraryastronomy