perihelion
perihelion[ˌpɛrɪˈhiːlɪən](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
语源- mid 17th cent.: alteration of modern Latin perihelium (by substitution of the Greek inflection -on), from Greek peri- 'around' + hēlios 'sun'
考试词汇表