aphelion
/æpˈhiːlɪən/noun
(pl. aphelia /-ljə/)
- Astronomy the point in the orbit of a planet, asteroid, or comet at which it is furthest from the sun【天文】远日点：
Mars is at aphelion.
火星处在远日点。PERIHELION的反义词。
词源
mid 17th cent.: alteration of modern Latin aphelium （by substitution of the Greek inflection -on）， from Greek aph'hēlion 'from the sun'.