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为什么太阳每天都能升起和落下呢？

太阳每天升起和落下是因为地球自转和公转的结果。地球自转是指地球以自身轴线为中心，在24小时内完成一次旋转。而地球公转是指地球围绕太阳运动，一个公转周期为大约365.25天。当地球自转使得我们的所在地面临太阳时，我们就能看见太阳升起；而当地球公转使得我们的所在地背离太阳时，我们就能看见太阳落下。

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