Aphelion and Perihelion

Aphelion is the greatest distance between a planet or other body and the Sun. Perihelion is the closest distance from the Sun. Objects move slowest in their orbits when they are aphelion and fastest when at perihelion.

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More Moon and Company The Moon and a supergiant Friday, January 4, 2008

Earth at Perihelion A tricky bit of stellar geography Tuesday, January 1, 2008

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Aphelion and Perihelion

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