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Ptolemy believed that the heavenly bodies' circular motions were caused by their being attached to unseen revolving solid spheres
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Nicolaus Copernicus published On The Revolutions of Heavenly Spheres just before his death, placed the sun at the center of the universe and argued that the Earth moved across the heavens as one of the planets
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De humani corporis fabrica libri septem is a set of books on human anatomy written by Andreas Vesalius and published in 1543.
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Between 1589–92, the Italian scientist Galileo Galilei is said to have dropped two spheres of different masses from the Leaning Tower of Pisa.
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Kepler's three laws of planetary motion can be started as follows: (1) All planets move about the sun in elliptical orbits, having the sun as one of the foci
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