33
/
AIzaSyB4mHJ5NPEv-XzF7P6NDYXjlkCWaeKw5bc
November 30, 2025
253170
22203
2
Public Timelines
FAQ

sep 18, 199 BC - Eratosthenes calculates the Earth's circumference

Description:

He calculated it to be 25,000 miles, which is very close to the real circumference.

Added to timeline:

9 Nov 2017
0
0
378

Date:

sep 18, 199 BC
Now
~ 2227 years ago

Images: