Definitions for: Aphelion

[n] apoapsis in solar orbit; the point in the orbit of a planet or comet that is at the greatest distance from the sun

Webster (1913) Definition: 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
perihelion.

Antonyms: perihelion

See Also: apoapsis, point of apoapsis