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拱點

出自維基百科,自由嘅百科全書

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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