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viction over and over again that the earth is
in motion. It is with him a pious belief, just
as it was with Pythagoras and his school
and with Aristarchus. ”But” (as Dreyer
says in his most interesting book, Tycho
Brahe ) ”proofs of the physical truth of his
system Copernicus had given none, and could
give none,” any more than Pythagoras or
Aristarchus.
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