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The earth together with its surrounding waters must in fact have such a shape as its shadow reveals, for it eclipses the moon with the arc of a perfect circle.

地球和它周围的水一定是这样的形状,就像它的影子所揭示的那样,因为它以一个完美的圆弧遮住了月亮。

— Nicolaus Copernicus 哥白尼

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