章動（ニューテーション）
astronomyEmbed This Widget
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<timefyi-glossary slug="nutation"></timefyi-glossary>定義
大きな歳差運動に重なった地球の自転軸の小さく不規則な振動。主な章動周期は約18.6年で、主に月の引力によって引き起こされる。