Eratosthenes- The early Greeks knew the Earth was a sphere based on the shadow of Earth on the Moon during lunar eclipses. Eratosthenes proceeded to use this information to measure the circumference of Earth. (jan 1, 220 BC – dec 1, 220 BC)
Added to timeline:
Date:
jan 1, 220 BC
dec 1, 220 BC
~ 11 months