First of all, we must note that the universe is spherical. - "Nicolaus Copernicus"

First of all, we must note that the universe is spherical.
Nicolaus Copernicus

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Accordingly, since nothing prevents the earth from moving, I suggest that we should now consider also whether several motions suit it, so that it can be regarded as one of the planets. For, it is not the center of all the revolutions.
- Nicolaus Copernicus
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We regard it as a certainty that the earth, enclosed between poles, is bounded by a spherical surface.
- Nicolaus Copernicus