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necesse est, eas hypotheses esse veras, imo
ne verisimiles quidem, sed sufficit hoc usum,
si calculum observationibus congruentem ex-
hibeant.”
BOOK II. THE DYNAMICAL PERIOD
5. DISCOVERY OF THE TRUE SO-
LAR SYSTEM–TYCHO BRAHE–KEPLER.
During the period of the intellectual and
aesthetic revival, at the beginning of the
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