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Those who know that the consensus of many centuries has sanctioned the conception that the earth remains at rest in the middle of the heavens as its center, would, I reflected, regard it as an insane pronouncement if I made the opposite assertion that the earth moves.

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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At rest, however, in the middle of everything is the sun.
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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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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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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.
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