From Wikipedia, the free encyclopedia
拱點(apsis)係指一粒行星嘅軌道當中離佢距離重力中心最遠同最近嘅位。
喺講地球圍太陽公轉嗰陣,遠日點(Aphelion)係指地球軌道當中最遠太陽嗰點,而近日點(Perihelion)係指地球軌道當中最近太陽嗰點。
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