Skip to definition.
Get the FREE one-click dictionary software for Windows or the iPhone/iPad and Android apps

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

Derived forms: aphelia, aphelions

Type of: apoapsis, point of apoapsis

Antonym: perihelion

Encyclopedia: Aphelion