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solstice

solstice (sŏlˈstĭs) [key] [Lat., = sun stands still], in astronomy, either of the two points on the ecliptic that lie midway between the equinoxes (separated from them by an angular distance of 90°). At the solstices the sun's apparent position on the celestial sphere reaches its greatest distance above or below the celestial equator (see equatorial coordinate system), about 231/2° of arc. At the time of summer solstice, about June 22, the sun is directly overhead at noon at the Tropic of Cancer (see tropics). In the Northern Hemisphere the longest day and shortest night of the year occur on this date, marking the beginning of summer. At winter solstice, about Dec. 22, the sun is overhead at noon at the Tropic of Capricorn; this marks the beginning of winter in the Northern Hemisphere. For several days before and after each solstice the sun appears to stand still in the sky, i.e., its noontime elevation does not seem to change from day to day.

The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.

More on solstice from Infoplease:

  • Winter Solstice for Kids - Dec. 21, 2012, 7:11 AM EST (11:11 UT), marks the solstice—the beginning of winter in the Northern Hemisphere and summer in the Southern Hemisphere
  • Summer Solstice for Kids - Understanding the Summer Solstice In 2014, summer begins June 21 6:51 A.M. EDT (10:51 UT*) by Karen ...
  • Winter Solstice - Winter Solstice Dec. 21, 2013, 12:11 PM EST (17:11 UT), marks the solstice—the beginning of ...
  • Winter Solstice - Winter Solstice Dec. 21, 2013, 12:11 PM EST (17:11 UT), marks the solstice—the beginning of ...
  • Summer Solstice - Solstice comes from the Latin (sol, sun; sistit, stands). For several days before and after each solstice, the sun appears to stand still in the sky—that is, its noontime elevation does not seem to change.

See more Encyclopedia articles on: Astronomy: General

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