Eratosthenes of Cyrene was an Ancient Greek polymath: a philosopher, scholar, mathematician, geographer, poet, astronomer, and music theorist. Eratosthenes eventually became the chief librarian at the Library of Alexandria. His work was the precursor to the modern discipline of geography, and he introduced some of its terminology, coining the terms geography and geographer. 276 BC – 194 BC; died at about 81. Alive at the same time as Qin Shi Huang, Plautus, Zeno of Citium, Archimedes, and Ashoka. Wiki link