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Noun: aphelion (aphelia,aphelions)  u'fee-lee-un
  1. Apoapsis in solar orbit; the point in the orbit of a planet or comet that is at the greatest distance from the sun
    "Earth reaches its aphelion in early July each year"

Derived forms: aphelia, aphelions

Type of: apoapsis, point of apoapsis

Antonym: perihelion

Encyclopedia: Aphelion