장동 (자전축 진동)
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<timefyi-glossary slug="nutation"></timefyi-glossary>정의
더 큰 세차 주기 위에 겹쳐지는 지구 자전축의 작고 불규칙한 진동입니다. 주요 장동 주기는 약 18.6년으로, 주로 달의 중력 인력에 의해 발생합니다.