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Hence I feel no shame in asserting that this whole region engirdled by the moon, and the center of the earth, traverse this grand circle amid the rest of the planets in an annual revolution around the sun. Near the sun is the center of the universe. 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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Thus indeed, as though seated on a royal throne, the sun governs the family of planets revolving around it.
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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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In so many and such important ways, then, do the planets bear witness to the earth's mobility.
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What appears to us as motions of the sun arise not from its motion but from the motion of the earth and our sphere, with which we revolve about the sun like any other planet. The earth has, then, more than one motion.
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Yet the widespread planetary theories, advanced by Ptolemy and most other astronomers, although consistent with the numerical data, seemed likewise to present no small difficulty. For these theories were not adequate unless they also conceived certain equalizing circles, which made the planet appear to move at all times with uniform velocity neither on its deferent sphere nor about its own epicycle's center.
Nicolaus Copernicus
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In every interview I have ever read or seen or taken part in, the final question in our future-oriented society is always, What next?
Jessica Savitch
Nicolaus Copernicus
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Born:
February 19, 1473
Died:
May 24, 1543
(aged 70)
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