Jewish Calendar and Astronomy

Explore the current or selected Jewish date alongside the observer sky, Sun, Moon, planets and astronomical time data.

Explore a selected moment and observer location in sky and space views. Compare Hebrew and civil dates, Jewish day numbers, Julian Date, solar and lunar positions, and rise, transit and set events.

Jewish Cosmology is an interactive research and educational web application connecting Hebrew dates, traditional Jewish calendar calculations and halachic concepts of time with the observable motions of the Sun, Moon and planets, astronomical seasons and eclipses.

JavaScript is required for the interactive explorers and calculations. The descriptions and navigation remain available without JavaScript.