I shall now recall to mind that the motion of the heavenly bodies is circular, since the motion appropriate to a sphere is rotation in a circle.
From Nicolaus Copernicus
The massive bulk of the earth does indeed shrink to insignificance in comparison with the size of the heavens.
Those things which I am saying now may be obscure, yet they will be made clearer in their proper place.
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.
So, influenced by these advisors and this hope, I have at length allowed my friends to publish the work, as they had long besought me to do.
In so many and such important ways, then, do the planets bear witness to the earth's mobility.
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