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在17世纪，天文学家伽利略通过他的望远镜观察太阳黑子，随后注意到这些黑子似乎在移动、消失、然后又再次出现。1613年，伽利略在笔记中写道：“这表明了它们的周期性运动与太阳有关”，可是他同时也写道或许是黑子是运动的而太阳是静止不动的，“对我来说，我更认为是太阳自身在运动而不是其他别的东西。”
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