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 EquatorThe March equinox is the moment the Sun crosses the celestial equator—an imaginary line in the sky above […]

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 PointThe June solstice is the moment the Sun is […]

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 EquatorThe September equinox is the moment the Sun crosses the celestial equator—an imaginary line […]

December Solstice: Longest and Shortest Day of the YearThere are two solstices every year: one in December and one in June. The December solstice marks the shortest day north of the equator and the longest day in the south.Sun Reaches Most Southerly PointThe […]