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每隔几年润一年

更新时间: 2020-11-01 00:00:00     

每隔四年一个闰年。闰年是根据太阳直射点的回归周期得来的,太阳直射点的回归周期是365天5时48分46,称为回归年,折为365.2422天。为了方便就把365作为一年,这就是平年。回归年比平年多出5时48分46,累计四年约等于一天,所以每4年就要闰一天,这一天放在2月,成为29天。

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