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Ptolemy showed the the Geocentric model also known as the Earth centered model.
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On this day Andreas Vesalius published a book on the human body.
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On this day Nicolaus Copernicus published his book showing the heliocentric model.
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Galileo did an experiment with to balls at the Leaning Tower of Pisa.
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On this day Francis Bacon published a book showing how far learning has come.
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Johannes Kepler discovered the his law of Planetary Motion and published it.
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Robert Hooke uses a microscope to discover cells.