Final answer:
Eratosthenes accurately calculated the Earth's circumference over 2,200 years ago using a simple method.
Explanation:
Eratosthenes, a Greek mathematician and astronomer, was the scientist who first calculated the Earth's circumference accurately over 2,200 years ago. He used a simple method of measuring the angle of a shadow cast by a stick in two different cities to determine the Earth's size.
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