Eratosthenes calculated the Earth's circumference and he was the first to attempt to produce a map of the World based on a system of lines of latitude and longitude. Hipparchus was the first to specify the positions of places on the Earth using latitude and longitude as coordinates. His work on spherical trigonometry led him to this system. He suggested measuring latitude, the distance north or south of the equator, by determining the ratio of the longest to the shortest day at tha

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