I consider it the chief duty of an astronomer to gather the observations of the heavenly bodies, and to explain their motions by hypotheses.
Heliocentric model of the solar system
Preface to 'De Revolutionibus Orbium Coelestium'
1543
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"Thus, the sun, although it is the center of the world, is not the center of the universe."
Controversial"For the motion which appears to us in the heavens is not in the heavens themselves, but in the earth."
Controversial"It is not incredible that the earth moves, but that it stands still, that is incredible."
Strange & Unusual"For it is the duty of an astronomer to gather by careful and skilled observation the history of the celestial movements, and then to investigate their causes or hypotheses about them, and then to pred…"
Controversial"And if the earth were not to move, such a great diversity of phenomena could not be observed."
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