aphelion

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English[edit]

Etymology[edit]

Greek form of Latin aphelium, from Ancient Greek ἀπό (apó, from) + ἥλιος (hḗlios, sun) (modelled after apogaeum). Compare perihelion.

Pronunciation[edit]

  • (UK) IPA(key): /əˈfiː.lɪ.ən/, /æpˈhiː.lɪ.ən/
  • (US) IPA(key): /əˈfiː.li.ən, -ˈfil.jən/, /æpˈhiː.li.ən, -ˈhil.jən/
    • (file)

Noun[edit]

aphelion (plural aphelia or (deprecated) aphelions)

  1. (astronomy) The point in the elliptical orbit of a planet, comet, etc., where it is farthest from the Sun.

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