Science Dictionary
aphelion  [%PREMIUM_LINK%]     (ə-fē'lē-ən)  Pronunciation Key 

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The point at which an orbiting body, such as a planet or comet, is farthest away from the Sun. Compare apogee, perihelion.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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