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He was the first person to go against what everyone said and said the world was round. He also manages to use the sun as a way to measure the Earth. -
Ptolemy was the first person to come up with a model of our solar system.His version was the wrong but it still was used for hundred of years. -
He proposed a different version of the solar system, with the Earth revolving around the Sun. He went against the previous models and it turns out that he was correct. -
He made the most accurte celestial obsrevations of his time. -
Kepple created three laws that involved the planets motion.