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perihelion n. 近日點 近日點 perihelion n 1: periapsis in solar orbit; the point in the orbit of a planet or comet where it is nearest to the sun [ant: {aphelion}] Perihelion \Per`i*hel"ion\, Perihelium \Per`i*he"li*um\, n.; pl.
{Perihelia}. [NL., fr. Gr. peri` about, near "h`lios the sun.] (Astron.) That point of the orbit of a planet or comet which is nearest to the sun; -- opposed to {aphelion}. [1913 Webster]
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