Meaning of perihelion

per•i•he•li•on

Pronunciation: (per"u-hē'lē-un, -hēl'yun), [key]
— pl. -he•li•a
  1. the point in the orbit of a planet or comet at which it is nearest to the sun. Cf.See diag. under
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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