In science today, I learned about a guy named Eratosthenes. He figured out the size of the earth by measuring the angle of the sun at 12:00 in two different places on the same day. This proved that the earth was round. About the same time, Eratosthenes figured out how to use latitude and longitude to mark an exact place on a map. This helped sailors avoid obstacles when they were plotting their course. Latitude and longitude are measured in degrees, getting wider the closer to the equator they are and narrowing at the poles.
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