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 axis.
Heliocentric model of the solar system
De revolutionibus orbium coelestium (describing Earth's motions)
1543
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"For it is the duty of an astronomer to compose the history of the celestial motions through careful and expert study."
Strange & Unusual"To know that we know what we know, and to know that we do not know what we do not know, that is true knowledge."
Strange & Unusual"Therefore, we must find a better way to explain the apparent motion of the heavens, which is so complicated and irregular."
Controversial"And so, in the first book, I describe the earth's general position and its various motions, and then I pass to the other planets, showing how their motions are related to the earth's."
Controversial"The earth also is spherical, since it presses upon its center from every direction."
Controversial