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北極星

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Precessional movement of Earth. Earth rotates (white arrows) about once a day around its rotational axis (red); this axis itself rotates slowly (white circle), completing a rotation in approximately 26,000 years[1]

地軸の歳差運動地球の回転軸が描く26,000年の巨大なサイクル

歳差運動地軸春分点天文学
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