sep 14, 240 BC - Eratosthenes
Description:
Eratosthenes estimates the earth's circumference (only off by just under 25,000 miles). Due to the knowledge of how large the earth was, it seemed unreasonable for it to be spinning so quickly without any evidence of its movement.Added to timeline:
Date:
sep 14, 240 BC
Now
~ 2268 years ago