<P> Eratosthenes of Cyrene ( / ɛr əˈtɒsθəniːz / ; Greek : Ἐρατοσθένης ὁ Κυρηναῖος , IPA : ( eratosthénɛːs ) ; c. 276 BC -- c. 195 / 194 BC ) was a Greek mathematician , geographer , poet , astronomer , and music theorist . He was a man of learning , becoming the chief librarian at the Library of Alexandria . He invented the discipline of geography , including the terminology used today . </P>
<P> Eratosthenes of Cyrene ( / ɛr əˈtɒsθəniːz / ; Greek : Ἐρατοσθένης ὁ Κυρηναῖος , IPA : ( eratosthénɛːs ) ; c. 276 BC -- c. 195 / 194 BC ) was a Greek mathematician , geographer , poet , astronomer , and music theorist . He was a man of learning , becoming the chief librarian at the Library of Alexandria . He invented the discipline of geography , including the terminology used today . </P>
who was the first to measure the earth circumference
who was the first to measure the earth circumference
Eratosthenes
Eratosthenes