详细解释:n. 近日点, 最高点, 顶点
词型变化：
形容词:perihelial名词复数:perihelia英语解释：
名词 perihelion:
periapsis in solar orbit; the point in the orbit of a planet or comet where it is nearest to the sun例句：
A comet is at perihelion when it is closest (=very close) to the sun.彗星最接近太阳时，它就是在近日点。