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天文用語

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The apsides refer to the farthest (2) and nearest (3) points reached by an orbiting planetary body (2 and 3) with respect to a primary, or host, body (1)

アプシス（近点・遠点）とは天体軌道の極点とそのメカニズム

アプシス近点遠点軌道要素
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