perihelion
/ˌperɪˈhiːlɪən/noun
(pl. perihelia /-lɪə/)
- Astronomy the point in the orbit of a planet, asteroid, or comet at which it is closest to the sun【天文】近日点。APHELION的反义词。
词源
mid 17th cent.: alteration of modern Latin perihelium （by substitution of the Greek inflection -on）, from Greek peri- 'around' + hēlios 'sun'.