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Eratosthenes of Cyrene (/ ɛr ə ˈ t ɒ s θ ə n iː z /; Greek: Ἐρατοσθένης [eratostʰénɛːs]; c. 276 BC – c. 195/194 BC) was a Greek polymath: a mathematician, geographer, poet, astronomer, and music theorist. He was a man of learning, becoming the chief librarian at the Library of Alexandria.
Eratosthenes, Greek scientific writer, astronomer, and poet, who made the first measurement of the size of Earth for which any details are known. He was also the director of the Library of Alexandria. His only surviving work is Catasterisms, a book about constellations.
- The Editors of Encyclopaedia Britannica
Mar 3, 2022 · Eratosthenes (l. c. 276-195 BCE) was a Greek astronomer, geographer, mathematician, and poet best known for being the first to calculate the circumference of the earth and its axial tilt.
- Joshua J. Mark
Learn how Eratosthenes used geometry and trigonometry to calculate the Earth's circumference in the 2nd century BCE. Explore his achievements in geography, astronomy, and chronology at the Library of Alexandria.
Jul 3, 2019 · Learn about Eratosthenes, the father of geography who calculated the circumference of the Earth and invented the sieve of Eratosthenes. Explore his life, achievements, and legacy in this biography.
- Matt Rosenberg
Jan 14, 2020 · Learn about Eratosthenes, who calculated the circumference of the earth and developed a sieve for prime numbers. He was a librarian at the Library of Alexandria and wrote on various topics, such as astronomy and philosophy.
194 BC. Alexandria, Egypt. Summary. Eratosthenes was a Greek mathematician who is famous for his work on prime numbers and for measuring the diameter of the earth. View one larger picture. Biography. Eratosthenes was born in Cyrene which is now in Libya in North Africa.
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