Solstice

Moments of the year when the sun reaches it's southernmost or northernmost position. There are two Solstices a year: The [Summer Solstice]? is the longest day of the year and marks the beginning of the summer. Similarly, the [Winter Solstice]? is the shortest day of the year, marking the beginning of winter.

[Summer Solstice]?s occur in the northern hemisphere on June 20,21 or 22 whereas the [Winter Solstice]? occurs on December 21 or 22. The same days apply for the southern hemisphere, only reversed (i.e., the [Summer Solstice]? occurs in December and the [Winter Solstice]? in June).

See also: Equinox