Eratosthenes was born around 276 BC in a Greek colony in Cyrene, a territory located in modern-day Libya. He was educated at the Father and son riding partners for life vintage shirt institutes of Athens and appointed by Pharoah Ptolemy III to run the Great Library in Alexandria in 245 BC. While serving as librarians and scholars, Eratosthenes wrote a comprehensive treatise on the world, called Geography. This is the first use of the word, in Greek literally meaning “writing about the earth”. Geography also introduces concepts of hot, temperate and cold climates.