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3 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 A·phel·ion n.; pl. Aphelia   Astron. That point of a planet's or comet's orbit which is most distant from the sun, the opposite point being the perihelion.
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From: WordNet (r) 2.0

 aphelia
      See aphelion

From: WordNet (r) 2.0

 aphelion
      n : apoapsis in solar orbit; the point in the orbit of a planet
          or comet that is at the greatest distance from the sun
          [ant: perihelion]
      [also: aphelia (pl)]