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aphelion vs. perihelion

aphelion
[uh-fee-lee-uhn, uh-feel-yuhn, ap-hee-lee-uhn] / əˈfi li ən, əˈfil yən, æpˈhi li ən /

noun

plural

aphelia

  1. Astronomy. the point in the orbit of a planet or a comet at which it is farthest from the sun.

perihelion
[per-uh-hee-lee-uhn, -heel-yuhn] / ˌpɛr əˈhi li ən, -ˈhil yən /

noun

Astronomy.

plural

perihelia

  1. the point in the orbit of a planet or comet at which it is nearest to the sun.