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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"We are thus brought to a standstill by the realization that our previous theories were not only complicated but also inconsistent."
Strange & Unusual"Therefore, since it is the heavens that contain all things, it is not the heavens that move, but rather the earth, which is contained within the heavens, that moves."
Strange & Unusual"Having thus assumed the motions which I ascribe to the earth, I have, after long and careful investigation, finally discovered that, if the motions of the other planets be related to the revolution of…"
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 to stand still, the appearance of the heavens would be very different."
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