Pouring forth its seas everywhere, then, the ocean envelops the earth and fills its deeper chasms.

quote by Nicolaus Copernicus
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We regard it as a certainty that the earth, enclosed between poles, is bounded by a spherical surface.

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Those things which I am saying now may be obscure, yet they will be made clearer in their proper place.

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More stars in the north are seen not to set, while in the south certain stars are no longer seen to rise.

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Yet if anyone believes that the earth rotates, surely he will hold that its motion is natural, not violent.

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The massive bulk of the earth does indeed shrink to insignificance in comparison with the size of the heavens.

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To know that we know what we know, and to know that we do not know what we do not know, that is true knowledge.

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Therefore, having obtained the opportunity from these sources, I too began to consider the mobility of the earth.

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For it is the duty of an astronomer to compose the history of the celestial motions through careful and expert study.

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Moreover, since the sun remains stationary, whatever appears as a motion of the sun is really due rather to the motion of the earth.

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