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An '''eclipse''' is an [[astronomical]] [[event]] that occurs when one [[celestial]] object moves into the [[shadow]] of another. The term is derived from the ancient [[Greek]] noun ἔκλειψις (ékleipsis), which is derived from the verb ἐκλείπω (ekleípō), "to cease to [[exist]],"[1] a combination of prefix εκ- (ek-), from preposition εκ, εξ (ek, ex), "out," and of verb λείπω (leípō), "to be [[absent]]".[2] [3] When an eclipse occurs within a stellar [[system]], such as the [http://en.wikipedia.org/wiki/ Solar_System Solar System], it forms a type of syzygy—the alignment of three or more celestial bodies in the same [[gravitational]] system along a straight line.[4]
The term eclipse is most often used to describe either a solar eclipse, when the [http://en.wikipedia.org/wiki/Moon Moon's] [[shadow]] crosses the [[Earth]]'s surface, or a lunar eclipse, when the Moon moves into the shadow of Earth. However, it can also refer to such events beyond the Earth-Moon system: for example, a planet moving into the shadow cast by one of its moons, a moon passing into the shadow cast by its host [[planet]], or a moon passing into the shadow of another moon. A [http://en.wikipedia.org/wiki/Binary_Star binary star] system can also produce eclipses if the plane of their orbit intersects the position of the [[observer]].[http://en.wikipedia.org/wiki/Eclipse]
[[Category: Astronomy]]
An '''eclipse''' is an [[astronomical]] [[event]] that occurs when one [[celestial]] object moves into the [[shadow]] of another. The term is derived from the ancient [[Greek]] noun ἔκλειψις (ékleipsis), which is derived from the verb ἐκλείπω (ekleípō), "to cease to [[exist]],"[1] a combination of prefix εκ- (ek-), from preposition εκ, εξ (ek, ex), "out," and of verb λείπω (leípō), "to be [[absent]]".[2] [3] When an eclipse occurs within a stellar [[system]], such as the [http://en.wikipedia.org/wiki/ Solar_System Solar System], it forms a type of syzygy—the alignment of three or more celestial bodies in the same [[gravitational]] system along a straight line.[4]
The term eclipse is most often used to describe either a solar eclipse, when the [http://en.wikipedia.org/wiki/Moon Moon's] [[shadow]] crosses the [[Earth]]'s surface, or a lunar eclipse, when the Moon moves into the shadow of Earth. However, it can also refer to such events beyond the Earth-Moon system: for example, a planet moving into the shadow cast by one of its moons, a moon passing into the shadow cast by its host [[planet]], or a moon passing into the shadow of another moon. A [http://en.wikipedia.org/wiki/Binary_Star binary star] system can also produce eclipses if the plane of their orbit intersects the position of the [[observer]].[http://en.wikipedia.org/wiki/Eclipse]
[[Category: Astronomy]]
