For it is the duty of an astronomer to compose the history of the celestial motions from a careful and skillful study of the observations.
Heliocentric model of the solar system
Preface to 'De Revolutionibus Orbium Coelestium'
1543
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"The earth has a spherical shape, for it is bounded on all sides by the circumference of a circle."
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."
Strange & Unusual"For I am convinced that the world is a single, unified system, and that all its parts are interrelated."
Strange & Unusual"Those things which I am saying now may be obscure, yet they will be made clearer in their proper place."
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