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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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S.O.S. Math - Trigonometry

http://www.sosmath.com/trig/trig.html

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Stanford Solar Center

http://solar-center.stanford.edu/

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Solar Images from SDAC

http://umbra.nascom.nasa.gov/images/latest.html

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Services for Professionals in Solar Energy and Radiation

http://www.soda-is.com/

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Solar Influence Data Center

http://sidc.oma.be/

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Solar UV Atlas from HRTS

http://umbra.nascom.nasa.gov/uv_atlas/atlas.html

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