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The sieve of Eratosthenes was discovered in 223 BC.
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He postulated the circumference of the earth.
He did not do so. Earth was well-known to be a globe for at least two hundred years before Eratosthenes' time. What Eratosthenes did was to measure the earth's circumference for the first time. He did that at some time between 236 BC and 195 BC.