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Claudius Ptolemaeus (circa 100–circa 170), known as Ptolemy, was an astronomer, mathematician, and geographer of Greek descent who lived and worked in the Egyptian city of Alexandria. In his Geography, Ptolemy gathered all the geographic knowledge possessed by the Greco-Roman world. He used a system of grid lines to plot the latitude and longitude of some 8,000 places on a map that encompassed the known world at the height of the Roman Empire. Ptolemy’s work was lost to Europe in the Middle Ages, but around 1300 Byzantine ...
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