Hypertext Webster Gateway: "Aphelia"
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.
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