Support Jewish Cosmology

Support Jewish Cosmology with a one-time contribution or monthly support.

Choose a contribution, dedication or monthly sponsorship to support Jewish learning and astronomy.

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.