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English Dictionary: aphelion by the DICT Development Group
2 results for aphelion
From WordNet (r) 3.0 (2006) [wn]:
  1. apoapsis in solar orbit; the point in the orbit of a planet or comet that is at the greatest distance from the sun
    Antonym(s): perihelion
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
   Aphelion \A*phel"ion\ (?; 277), n.; pl. {Aphelia}. [Gr. [?] +
      [?] sun.] (Astron.)
      That point of a planet's or comet's orbit which is most
      distant from the sun, the opposite point being the
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