One of the most brilliant men of science in the ancient world, Eratosthenes was best known as a scholar and librarian in his day, But he made his greatest contribution to science in the realms of geometry and astronomy fueled by his curiosity, ingenuity and reason. From his home in the Egyptian city of Alexandria, he used a chance reading from a book at the library of Alexandria to devise a method of determining the shape and size of the earth. Not stopping there, he later determined the size and distance to the moon with fair accuracy and even attempted the same of the sun.

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