[aph.elion] n, pl -elia [NL, fr. apo- + Gk helios sun--more at solar] (1656): the point in the path of a celestial body (as a planet) that is farthest from the sun--compare perihelion
APHELION
Meaning of APHELION in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012