June 21st and December 21st, the shortest and longest nights of the year.
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The winter solstice is the shortest day and longest night of the year, occurring around December 21st in the Northern Hemisphere and June 21st in the Southern Hemisphere. The summer solstice is the longest day and shortest night of the year, occurring around June 21st in the Northern Hemisphere and December 21st in the Southern Hemisphere. These celestial events mark the points in the Earth's orbit where one hemisphere is tilted closest to or farthest away from the sun.
Winter and summer solstice are, respectively, the longest and shortest days of the year.
Winter solstice is also the first day of winter, summer solstice the first day of summer.
The two seasons that begin with solstices rather than equinoxes are summer and winter.
The first day of summer is known as the summer solstice, while the first day of winter is called the winter solstice. These solstices occur when the sun reaches its highest or lowest position in the sky, resulting in the longest or shortest day of the year.
The Tropic of Cancer and the Tropic of Capricorn.
On the equinoxes day and night are of equal duration. On the solstices the difference between day and night are their maximum (longest day for summer solstice ... shortest day for winter).
The first day of a season is called the "equinox" or the "solstice," depending on the season. The spring and autumn equinoxes occur around March 20-21 and September 22-23, while the summer and winter solstices occur around June 21-22 and December 21-22.