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What was one contribution made by Eratosthenes in ancient Greece?
He wrote a geometry textbook that was used for nearly 2,000 years.
He calculated the value of the infinite number known as pi.
He computed the circumference of planet Earth.
He developed military tactics that still apply today.
Eratosthenes is best known for computing the circumference of planet Earth. He made this remarkable calculation by measuring the angle of the Sun’s rays at two different locations in Egypt and using the distance between those locations. This was a pioneering effort in geography and demonstrated an early understanding of the Earth’s size and shape.