Perihelion

[,perɪ'hiːlɪən] or [,pɛrɪ'hilɪən]

(noun.) periapsis in solar orbit; the point in the orbit of a planet or comet where it is nearest to the sun.

Checked by Enrique--From WordNet

(n.) Alt. of Perihelium

Checked by Carmen

n. the point of the orbit of a planet or a comet at which it is nearest to the sun—opp. to Aphelion.—Also Perihē′lium.

Edited by Guthrie

Checker: Victoria