perihelion是什么意思_perihelion怎么读_音标ˌperɪ'hi:lɪən
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perihepon是什么意思音标:英 [ˌperɪ'hi:lɪən]美 [ˌperɪ'hi:lɪrn]
n. 近日点, 最高点, 顶点
n. periapsis in solar orbit; the point in the orbit of a planet or comet where it is nearest to the sun
perihepon的用法和例句：
1.But we're on course to take advantage of the orbital eccentricity and meet it at its perihepon.
但我们正准备利用 轨道偏心率 并在其近日点达到要求