Astrophysics (index)about

Solstice

(moment when Sun reaches its northern- or southern-most position)

A Solstice is the moment when the Sun reaches its most southern or northern position in the Celestial Sphere, occurring on the days when the hemisphere has the most or least sunlight, i.e., the days of the year with the longest and shortest daylight. The Summer Solstice occurs on the longest day in the Summer, and the Winter Solstice, the shortest day in Winter. As summer and winter are opposed in the two hemispheres, summer solstice in the northern hemisphere is the same moment as winter solstice in the southern, and vice versa.


(event type,Earth,Sun)
http://en.wikipedia.org/wiki/Solstice

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