📁 日食

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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How Stuff Works: Sun
http://www.howstuffworks.com/sun.htm
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HelioClim Solar Radiation
http://www.helioclim.org/index.html
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