His writings remained the basis of European astronomy throughout the Middle Ages. At that time Ptolemy derived his maps from a curved globe and developed the system of latitude and longitude. It is commonly assumed that people from early antiquity generally believed the world was flat, but by the time of Pliny the Elder (1st century) its spherical shape was generally acknowledged. The notion of a Flat Earth refers to the idea that the inhabited surface of the Earth is flat, rather than curved.
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