There are two equinoxes every year: one in March and one in September. In March, the Sun crosses the equator from south to north. Sun Crosses Celestial Equator The March equinox is the moment the Sun crosses the celestial equator—an imaginary line in the […]

There are two solstices every year: one in June and one in December. The June solstice marks the longest day north of the equator and the shortest day in the south. Sun Reaches Most Northerly Point The June solstice is the moment the […]

There are two equinoxes every year: one in March and one in September. In September, the Sun crosses the equator from north to south. Sun Crosses Celestial Equator The September equinox is the moment the Sun crosses the celestial equator—an […]