The December solstice occurs on December 21 or December 22 of most years, and is known by different names in different hemispheres of Earth: Solstice is an astronomical term regarding the position of the Sun in relation to the celestial equator. ... Jump to: navigation, search December 21 is the 355th day of the year (356th in leap years) in the Gregorian Calendar. ... Jump to: navigation, search December 22 is the 356th day of the year (357th in leap years) in the Gregorian Calendar. ...
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The solstices then, together with the equinoxes, are the defining moments of the start of the (astronomical) seasons, except in China, where they mark their centers.
During the June solstice the Sun appears to be directly overhead at noon for places situated at latitude 23.44° north, known as the tropic of Cancer.
The solstices are the dates that the Sun stays farthest away from the zenith, only reaching an altitude of 66.56° either to the north or the south.
In astronomy, the winter solstice is the moment when the earth is at a point in its orbit where one hemisphere is most inclined away from the sun.
Solstice is a Latin borrowing and means "sun stand", referring to the appearance that the sun's noontime elevation change stops its progress, either northerly or southerly.
Since the winter solstice, summer solstice, vernal equinox, and autumnal equinox were probably observed for the first time by people in the northern hemisphere, these naming conventions originally corresponded to the northern hemisphere's seasons.
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