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为什么一年中日食和月食的总数不能超过7次?

问答题
2022-06-30 16:59
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正确答案

因为一个食年中最多只能发生4次日食和两次月食,而一个回归年比一个食年约长19天,最多只能再多一个月食或日食。


试题解析

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