For it is not necessary that hypotheses should be true, or even probable; it is enough if they provide a calculus which agrees with the observations.
Heliocentric model of the solar system
Preface to De revolutionibus orbium coelestium (Osiander's anonymous preface, not Copernicus's words, but often associated with the book)
1543
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"Therefore, if the Earth moved, it would necessarily move with a triple motion: one, the diurnal rotation on its own axis; another, the annual revolution around the Sun; and a third, the motion of its …"
Strange & Unusual"There are three kinds of motion of the earth, as I shall demonstrate below."
Controversial"Yet because the novelty of the undertaking, which I knew to be contrary to the accepted views of the common people, might be regarded as absurd, I long hesitated."
Controversial"For the motions of the planets are so much more orderly and harmonious if they are referred to the sun as the center."
Controversial"The sphere is the most perfect of all figures, hence it is the form of the world."
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