For the crater named after him, see Eratosthenes crater. For the ancient Athenian statesman of the fifth century BC, see Eratosthenes statesman.
See also: History of geodesy and history of longitude. Sieve of Eratosthenes: algorithm steps for primes below including optimization of starting from prime's square. Main articles: Sieve of Eratosthenes and primality test. Strabo Geography , i. Eratosthenes' Geography. New Jersey: Princeton University Press, The Illustrated Encyclopedia of the Universe.
Cornell University. Accessed 28 July, Retrieved Asimov's Biographical Encyclopedia of Science and Technology , new revised edition. Entry 42, "Eratosthenes", Page Pan Books Ltd, London. I, Narrative ; Vol. II, Sources and Studies0. Cambridge: Cambridge University Press, New ed. Story of the Delhi Iron Pillar.
Foundation Books. November Review of D. Roller 'Eratosthenes' Geography. The Classical Review. New York: Charles Scribner's Sons, Cool Cosmos. Archived from the original on Plato as "Architect of Science". Archimedes Life Works and Machines. See p. Aujac, G. Bulmer-Thomas, Ivor — Selections Illustlating the History of Greek Mathematics. Cambridge, Massachusetts: Harvard University Press. Diller, A Dorofeeva, A. V Shkole in Russian 4 : i.
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Dutka, J. Exact Sci. El'natanov, B.
Fischer, I Quarterly Journal of the Royal Astronomical Society. Fowler, D. Fraser, P. Proceedings of the British Academy. Ptolemaic Alexandria. Oxford: Clarendon Press.
Goulet ed. Geus K. Eratosthenes von Kyrene. Studien zur hellenistischen Kultur- und Wissenschaftgeschichte. Goldstein, B. Historia Math. Gulbekian, E. Archive for History of Exact Sciences. Honigmann, E. Knaack, G. Pauly—Wissowa VI : — Manna, F. Atti Accad. Pontaniana N. Muwaf, A.
Arabic Sci. Nicastro, Nicholas Circumference: Eratosthenes and the ancient quest to measure the globe. New York: St. Martin's Press. O'Connor, John J. Marcotte, D. Argoud, J. Guillaumin eds. McPhail, Cameron Dunedin, New Zealand. Pfeiffer, Rudolf Rawlins, D. Is it the earliest surviving instance of spherical cartography? Did it supply the stades arc for Eratosthenes' experiment?
Bibcode : DIO Roller, Duane W.
Eratosthenes' Geography: Fragments collected and translated, with commentary and additional material. Princeton: Princeton University Press. Shcheglov, D. Geographia Antiqua 13 : 21— He calculated the circumference on his own and obtained a figure of 18, miles—about 7, miles too short. During the Middle Ages, most scholars accepted Eratosthenes' circumference, though Christopher Columbus used Posidonius' measurement to convince his supporters that he could quickly reach Asia by sailing west from Europe. As we now know, this was a critical error on Columbus' part. Had he used Eratosthenes' figure instead, Columbus would have known he was not yet in Asia when he landed in the New World.
A noted polymath, Eratosthenes also made notable contributions to the field of mathematics, including the invention of an algorithm used to identify prime numbers. His method involved taking a table of whole numbers 1, 2, 3, etc.
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This method became known as the sieve of Eratosthenes, as it works by filtering out the non-prime numbers in the same way that a sieve filters solids out of liquids. In his old age, Eratosthenes became blind and he died of self-induced starvation in either or BCE in Alexandria, Egypt. He lived to be about 80 to 84 years old. Eratosthenes was one of the greatest Greek polymaths, and his work influenced later innovators in fields ranging from mathematics to geography.
Admirers of the Greek thinker called him Pentathlos , after the Greek athletes known for their prowess in a number of different events. A crater on the Moon was named in his honor.
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