His devotees nicknamed him Pentathlos after the Olympians who were well rounded competitors, for he had proven himself to be knowledgeable in every area of learning. He was a figure of influence in many fields who yearned to understand the complexities of the entire world. In number theory, he introduced the sieve of Eratosthenes, an efficient method of identifying prime numbers. He created the first global projection of the world, incorporating parallels and meridians based on the available geographic knowledge of his era.Įratosthenes was the founder of scientific chronology he used Egyptian and Persian records to estimate the dates of the main events of the mythical Trojan War, dating the sack of Troy to 1183 BC. He was also the first to calculate Earth's axial tilt, which has also proved to have remarkable accuracy. ![]() He is best known for being the first person known to calculate the circumference of the Earth, which he did by using the extensive survey results he could access in his role at the Library his calculation was remarkably accurate. His work is comparable to what is now known as the study of geography, and he introduced some of the terminology still used today. He was a man of learning, becoming the chief librarian at the Library of Alexandria. ![]() 195/194 BC) was a Greek polymath: a mathematician, geographer, poet, astronomer, and music theorist.
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