Hypertext Webster Gateway: "aphelion"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Aphelion \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.
From WordNet (r) 1.7 (wn)
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
[ant: {perihelion}]
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