Eratosthenes

=Eratosthenes=

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= Important Mathematical Discoveries =

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Eratosthenes was born in a town called Cyrene that was known as the modern day Libya. Eratosthenes came up with Sieve of Eratosthenes and prime and composite numbers. He was also one of three chiefs that ran the great library of Alexandria which then, was the main place to learn about the history of the ancient world. Eratosthenes had studied in Alexandria and Athens for some time. About 236 B.C. Eratosthenes was appointed to be the librarian of the city Alexandra. In 195 B.C. before his death in the Capital of Ptolemaic Egypt the year 194 B.C, Eratosthenes was blind in one eye, then soon later both. ====== = Work Outside of Eratosthenes out of mathematics ,= He was the student of an extremely great poet whos work is stlil known today,he was an athlete, Studied Geography, was an astronomer, and he had many theories about musical art's. he was 3rd chief of the Great Library of Alexandria it was the center of science in the ancient world ,and he died in the capatal of ptolemainc egypt. == = Other Important Information = Eratosthenes was the First Person ever in history to say the word"Geography",and he invented the measurements of Latitude and Longitude. He also calculated the length and circumfrence of the Earth by using measurement system called Stades. Even Eratosthenes found out that the earth was round, by putting two stick’s a half a mile apart from each other and the sun. He thought that if the earth was flat he should get the same shadow, but he didn’t. As he found out that the shadows were different he had thought that maybe that earth is round.

= Fun Facts = = Pictures =
 * Eratosthenes was so smart he could estimate, the size of the Earth just by looking at shadows at different times in different parts of the world.
 * He also studied with some other mathematicians known as the lysanias of cyrene and a philospher, who is Ariston of Chios.
 * After his death in 194 B.C he had a Crater named after him.
 * Many people also called him "beta" which is the second letter in the greek Alphabet, he was called this because he was never first.
 * Eratosthens was mathmatishoin & a poet,an active man, geographer, astronamer, and a music therorist.

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