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为什么太阳升起和落下？

太阳升起和落下是由于地球的自转引起的。地球每天自转一次，从东向西旋转，因此当某个地方是正午时，它正好位于太阳直射点上方，看到太阳高挂在天空中。随着地球的自转，太阳从东方升起，逐渐达到高潮，然后再渐渐落下。这个过程中，我们看到的太阳的位置会不断变化。

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