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eclipse
An eclipse is an astronomical event that occurs when an astronomical object is temporarily obscured, either by passing into the shadow of another body or by having another body pass between it and the viewer. An eclipse is a type of syzygy.
The term eclipse is most often used to describe either a solar eclipse, when the Moon's shadow crosses the Earth's surface, or a lunar eclipse, when the Moon moves into the Earth's shadow. 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 binary star system can also produce eclipses if the plane of the orbit of its constituent stars intersects the observer's position.
==Etymology==
The term is derived from the ancient Greek noun ('), which means "the abandonment", "the downfall", or "the darkening of a heavenly body", which is derived from the verb (') which means "to abandon", "to darken", or "to cease to exist,"〔http://www.in.gr/dictionary/lookup.asp?Word=%E5%EA%EB%E5%DF%F0%F9+++&x=0&y=0〕 a combination of prefix ('), from preposition ('), "out," and of verb ('), "to be absent".〔http://www.lingvozone.com/main.jsp?action=translation&do=dictionary&language_id_from=23&language_id_to=8&word=%CE%BB%CE%B5%CE%AF%CF%80%CF%89+&t.x=55&t.y=16〕〔http://translate.google.com/translate_t?prev=hp&hl=en&js=y&text=%CE%BB%CE%B5%CE%AF%CF%80%CF%89&sl=el&tl=en&history_state0=&swap=1#〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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