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Eclipses occur when a planet casts a shadow on a satellite or vice-versa. The term often refers specifically to eclipses of the Sun and Moon, in which case the planet involved is Earth.

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Aesop's Phrases
http://aesopus.web.fc2.com/idiom/Phrase.html
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Analemma
http://www.analemma.com/
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AAS Solar Physics Division
http://umbra.nascom.nasa.gov/aas_spd/
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