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Ptolemy created the geocentric model after Aristotle made his. He wanted to explain how the planets moved in his own way since there was still many questions Aristotle's model couldn't.
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On The Revolutions of Heavenly Spheres is a book who Nicolaus Copernicus wrote when he was studying about the planets. It was about the heliocentric theory that he created.
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Galileo made an experiment of the Leaning Tower of Pisa, he went to the top of the tower and did that experiment.
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Johannes Kepler made a system of 3 laws not about where the planets were but about how they moved and orbited.
