Etymology
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perihelion (n.)

"point at which a planet or comet is nearest the Sun," 1680s, coined in Modern Latin (perihelium) by Kepler (1596) from Latinizations of Greek peri "near" (see peri-) + hēlios "sun" (from PIE root *sawel- "the sun"). Subsequently re-Greeked.

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Definitions of perihelion

perihelion (n.)
periapsis in solar orbit; the point in the orbit of a planet or comet where it is nearest to the sun;
From wordnet.princeton.edu