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Eratosthenes is most famous for making the first good measurement of the size of Earth. He did that sometime around 240 B.C. He knew that there was no shadow at the bottom of a well in the town of Syene on the summer solstice.

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Sutori is the best way to share your story.

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Kaci Luczeczko & Sean Masci Eratosthenes lived during 276-197 B.C. and he was the first to make good measurements of the Earth. Ptolemy lived during 85-165 A.D. He formed the geocentric theory, meaning the world was the center of the universe and everything else orbit it.

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Ptolemy was a Greek astronomer who lived between 85-165 A.D. He put together his own ideas with those of Aristotle and Hipparchus and formed the geocentric theory. This theory states that the Earth was at the center of the universe and all other heavenly bodies circled it, a model which held for 1400 years until the time of Copernicus.

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Presentations for the classroom in a unique timeline format. On Sutori, teachers and students create a variety of projects, assignments and portfolios. Perfect for the flipped classroom and collaborative work, Sutori's student-first approach brings the best out of your curriculum and lesson plans.

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Eratosthenes was an early influential astronomer that left his mark on the astronomical world. From the time he was born, in 276 B.C.E. till the time he died, 194 B.C.E. he had many major accomplishments. Some of these accomplishment include finding the size of the Earth, working at the Great Library, writing poems on astronomy, and playwright for theater.