Perihelion



[per-uh-hee-lee-uh n, -heel-yuh n] /ˌpɛr əˈhi li ən, -ˈhil yən/

noun, plural perihelia
[per-uh-hee-lee-uh, -heel-yuh] /ˌpɛr əˈhi li ə, -ˈhil yə/ (Show IPA). Astronomy.
1.
the point in the orbit of a planet or comet at which it is nearest to the sun.
/ˌpɛrɪˈhiːlɪən/
noun (pl) -lia (-lɪə)
1.
the point in its orbit when a planet or comet is nearest the sun Compare aphelion
n.

“point at which a celestial body is nearest the Sun,” 1680s, coined in Modern Latin (perihelium) by Kepler (1596) from Latinizations of Greek peri “near” (see peri-) + helios “sun” (see sol). Subsequently re-Greeked.
perihelion
(pěr’ə-hē’lē-ən)

The point at which an orbiting object, such as a planet or a comet, is closest to the Sun. Compare aphelion, perigee.

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