For it is manifest that the movements of the planets are not uniform, but sometimes faster, sometimes slower, sometimes direct, sometimes retrograde.
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"Nor do I doubt that learned and skillful mathematicians will agree with me if they are willing to give not superficial but profound attention to the arguments I adduce in this work."
"The sphere is the most perfect of all figures, hence it is the form of the world."
"For the motion of the earth is not a simple motion, but a composite of many motions."
"Therefore, I think that the earth is not the center of the universe, but rather the sun."
"The order of the planets is this: Saturn, Jupiter, Mars, Earth, Venus, Mercury."
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