eclipses

observerly’s lightweight, zero-dependency, fully-tree shakeable type-safe astrometry library for TypeScript. Accurately determine the positions of the Sun, Moon, and planets, handle coordinate transformations with ease, calculate transit times for any celestial object and integrate precision astronomy into your projects.

Chinese astronomical calendar, bazi (四柱八字), and divination for TypeScript. Solar terms (節氣) to sub-second precision, lunar calendar (農曆), flying stars (紫白九星), almanac flags (神煞), Six Ren (大六壬) — zero dependencies.

Source code for the MinuteLabs.io Eclipse Explorer

Visualize weather forecasts to help plan your trip to see an eclipse! 🌑🌞

Caelis Engine, Deterministic astronomical computation engine for JavaScript. VSOP87B + ELP/MPP02-LLR. No server. No API key. No dependencies. Schema v3.1.

An interactive astronomical visualization that projects the night sky onto Earth

Data, code, images, and text to enlarge one's world

An interactive atlas of historical astronomy phenomena across 5000 years

Simulador 3D del sistema solar a escala real: efemérides del JPL, 8920 estrellas a su distancia verdadera, eclipses calculados por geometría de sombras y las sondas Voyager. En español, sin instalar nada.

Free machine-readable dates for retrogrades, moon phases, eclipses, zodiac seasons and planetary ingresses — computed from the Swiss Ephemeris.