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为什么一天有24小时？

一天有24小时是因为地球自转一周大约需要24小时。地球以自西向东的方向自转，使得太阳看起来从东方升起、到达最高点，再向西方落下。这一天称为地球日。地球自转的速度是相对稳定的，所以人们将一天分为24小时，每小时60分钟，每分钟60秒的时间单位。

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