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Ptolemy discovered the geocentric theory.
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He was a Polish astronomer that discovered that the earth is titled.
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Andreas discovered human dissection and made a book about it.
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Galileo discovered four of the moons circling Jupiter, to study Saturn, to observe the phases of Venus, and to study sunspots on the Sun.
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He discovered cells by using a microscope.
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Johannes Kepler discovered the laws of planetary motion.
