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月の周期

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A full lunar day observed from the Earth, where orbital libration causes the apparent wobble.

月の一日（ルナ・デイ）とは？地球との違いや周期の仕組みを解説

月の一日ルナ・デイ朔望月恒星月
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Animation of the Moon as it cycles through its phases, as seen from the Northern Hemisphere. The apparent wobbling of the Moon is known as libration.

太陰月（ルナ・マンス）の定義と5つの天文学的周期

太陰月朔望月恒星月近点月
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