The History of Geodes: Global Positioning Tutorial

August 31, 2025

https://oceanservice.noaa.gov/education/tutorial_geodesy/geo02_hist.html#:~:text=Around%20250%20B.C.%2C%20another%20Greek,the%20rays%20of%20the%20sun.

Around 250 B.C., another Greek philosopher, Eratosthenes, measured the circumference of the Earth using the following equation: