Explore Jewish time through astronomy.
Solar Declination and the Seasons
The Sun’s angular position north or south of the celestial equator and its role in the local sky.
The quantity
Solar declination is the Sun’s angular coordinate north or south of the celestial equator. It is distinct from altitude above a local horizon and from ecliptic or zodiac longitude.
Astronomical meaning
Declination changes through the year as Earth orbits the Sun with its tilted axis. Together with observer latitude and the Sun’s hour angle, it determines geometric altitude. It helps explain changing noon heights and seasonal daylight patterns.
Use in Jewish Cosmology
The Sun and Seasons explorers connect solar coordinates, local observation and seasonal events. Planet and zodiac readouts distinguish coordinate systems and constellation membership. Declination is a geometric quantity, not a definition of a zman or a traditional mazal.
Explore related concepts
About Jewish Cosmology
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.
Models, terminology and limitationsHalachic times are unverified, have no rabbinic approval, and must not be relied upon for practical halachic decisions unless and until an appropriate authority approves them.