The earth has a spherical shape, for it is bounded on all sides by the circumference of a circle.
Heliocentric model of the solar system
From 'De Revolutionibus Orbium Coelestium', Book I, Chapter 2
1543
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"For the motion of the earth is a fact, and the apparent change of position of the fixed stars is due to the earth's motion and not to any motion of the stars themselves."
Controversial"To attack me, some people, who know nothing of mathematics, yet dare to pass judgment on these things, on the strength of some passage of Scripture, twisted to their purpose, are now presumptuously at…"
Controversial"Thus, the sun, although it is the center of the world, is not the center of the universe."
Controversial"For it is clear that the earth performs a double motion: one about its axis, and another about the sun."
Controversial"So that we may not err, we should always follow the footsteps of the ancients."
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