Perihelion
Noun
1.
perihelion
- periapsis in solar orbit; the point in the orbit of a planet or comet where it is nearest to the sun
periapsis
,
point of periapsis
- (astronomy) the point in as orbit closest to the body being orbited
aphelion
- apoapsis in solar orbit; the point in the orbit of a planet or comet that is at the greatest distance from the sun
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