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figured out the circrufance of the earth
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he thought the earth was at the centar of the universe
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figured out that the sun was in the centar of the universe he chaged the thinking of many people
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he made an observation about the universe that changed the organisation
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he figured out planetary movements witch led to orbits
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he created calculus witch led to clear optics
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he came up with the theory of wave length it advanced evreybody understaning of astromney and phiscs