牛顿说,既然胡克的著作《证明地球运动的尝试》的主题是证明地球绕太阳公转,并提出可以通过观测恒星一年中的视差变化来证明这个主题(后来的天文学家也确实是用这种方法进行证明的),于是牛顿就提出了一个证明地球自转的实验。
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