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The first person who propose that earth is sphere is Pythagoras. 

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The first person who propose that earth is sphere is Pythagoras. 

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Anagoras- a pupil of Pythagoras who supported that the earth is sphere (500-430 B. C), he observed that during luar eclipse, that the earth shadow was reflected on the moon's surface. 

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Anagoras- a pupil of Pythagoras who supported that the earth is sphere (500-430 B. C), he observed that during luar eclipse, that the earth shadow was reflected on the moon's surface. 

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Aristotle- validated the idea of Pythagoras centuries later(340 B. C) 

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Aristotle- validated the idea of Pythagoras centuries later(340 B. C) 

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Eratosthenes- a person who provides proof that earth is sphere, he is also the one who gave the accurate size during their time (240 B. C)

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Eratosthenes- a person who provides proof that earth is sphere, he is also the one who gave the accurate size during their time (240 B. C)