Aphelion

[æp'hiːlɪən] or [æ'filɪən]

(noun.) apoapsis in solar orbit; the point in the orbit of a planet or comet that is at the greatest distance from the sun.

Checked by Brady--From WordNet

(n.) That point of a planet's or comet's orbit which is most distant from the sun, the opposite point being the perihelion.

Checker: Zachariah

n. the point of a planet's orbit farthest away from the sun:—pl. Aphē′lia.

Typist: Xavier