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WIKIPEDIA FOR SCHOOLS: English - Spanish - French - Portuguese

Ecliptic longitude - Wikipedia, the free encyclopedia Wikipedia (2007) - wikipedia2007.classicistranieri.com

Ecliptic longitude

From Wikipedia, the free encyclopedia

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Ecliptic longitude (solar longitude or celestial longitude) is one of the co-ordinates which can be used to define the location of an astronomical object on the celestial sphere in the ecliptic coordinate system. In this system, the celestial sphere is divided into two hemispheres by the plane of the ecliptic.

The ecliptic is the path followed by the sun across the celestial sphere during the year. It crosses the celestial equator twice during the year, once at the Autumnal equinox and once at the Vernal equinox. There is no obvious point along the ecliptic at which ecliptic longitude should be zero, and so zero is arbitrarily defined as the location of the sun at Vernal equinox. Ecliptic longitude is then the angular distance of the object eastwards along the ecliptic from this point.

Ecliptic co-ordinates are most useful for solar system objects. For example when an almanac give the longitude of the Sun, ecliptic longitude is meant.

[edit] Celestial longitude for other planets

Main article: Planetocentric longitude

[edit] See also

Retrieved from "http://en.wikipedia.org../../../e/c/l/Ecliptic_longitude.html"
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STATIC WIKIPEDIA JUNE 2008 on wikipedia2006.classicistranieri.com

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