Eratosthenes

Eratosthenes (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. Eratosthenes was also known as Beta: his erudition in many disciplines was remarkable but he often ranked second in all of them. It seems this nickname was chosen by those who disliked him, since Eratosthenes eventually proved that he was one step ahead of his contemporaries in several important areas of learning.