Question

What was one contribution made by Eratosthenes in ancient Greece?

Answer 1

One contribution of Eratosthenes was trhat he was the first to calculate the circumference of the Earth and also the tilt of earth´s axis. He is said to have drawn the first known map of the world, including meridians and parallels, for which he is considered as the inventor of geography.

Answer 2

A particularly famous contribution made by Eratosthenes would be the sieve of Eratosthenes. This is an algorithm used for find all of the prime numbers up to a named limit. It can also be used within arithmetic progressions to find prime numbers, too.