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[[File:Eratosthenes.jpg|right]]
[[File:Eratosthenes.jpg|right]]
'''Eratosthenes''' of Cyrene (275-194 B.C.) was a scientific writer, astronomer, geographer and poet. He was the first to calculate the circumference of the Earth. His technique is the earliest known proof that the Earth is round. He also calculated the tilting of the earth's axis during rotation. He was head librarian at the [[Library of Alexandria]].
'''Eratosthenes of Cyrene''' (275-194 B.C.) was a scientific writer, astronomer, geographer and poet. He was the first to calculate the circumference of the Earth. His technique is the earliest known proof that the Earth is round. He also calculated the tilting of the earth's axis during rotation. He was head librarian at the [[Library of Alexandria]].
Eratosthenes also invented the [[sieve of Eratosthenes]], which is a technique for separating composite from prime numbers in a natural series. The sieve appears in the ''Introduction to arithmetic'' by [[Nicomedes]].
Eratosthenes also invented the [[sieve of Eratosthenes]], which is a technique for separating composite from prime numbers in a natural series. The sieve appears in the ''Introduction to arithmetic'' by [[Nicomedes]].