EPISODE · Dec 21, 2019 · 4 MIN
冬至里最短的白天，但也是最长的一天
from 天文随心听｜讲述宇宙与人的故事
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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冬至里最短的白天，但也是最长的一天
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