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天文随心听|讲述宇宙与人的故事

冬至里最短的白天,但也是最长的一天

21 Dec 2019

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当我们说一年中最长的一天会在每年冬至左右来到时,这并不是白天,而是从太阳正午(太阳在中天的时刻)或正午到下一个正午之间的间隔,在冬至这天,地球相对正午太阳自转一周的时间比平时长大约半分钟。

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