Person
Eratosthenes
Eratosthenes of Cyrene was a Greek scholar who became head of the Library of Alexandria under the Ptolemies. He made a remarkably close estimate of the Earth's circumference from the angle of the sun at Syene and Alexandria, drew a map of the known world with lines of latitude and longitude, and devised a method for finding prime numbers. His geography, quoted by Strabo, described Arabia and its peoples.
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- APA
- The Epoch Institute. (2026). Eratosthenes. In The Epoch Institute Encyclopedia. https://the-epoch-institute.org/encyclopedia/eratosthenes
- MLA
- “Eratosthenes.” The Epoch Institute Encyclopedia, The Epoch Institute, 2026, https://the-epoch-institute.org/encyclopedia/eratosthenes. Accessed .
- Chicago
- The Epoch Institute. “Eratosthenes.” The Epoch Institute Encyclopedia. 2026. https://the-epoch-institute.org/encyclopedia/eratosthenes.
- Harvard
- The Epoch Institute (2026) ‘Eratosthenes’, The Epoch Institute Encyclopedia. Available at: https://the-epoch-institute.org/encyclopedia/eratosthenes (Accessed: ).
Last reviewed October 2026Random entry ↻