Eratosthenes
The first person to determine the size of Earth was Eratosthenes of Cyrene, who produced a surprisingly good measurement using a simple scheme that combined geometrical calculations with physical observations. Eratosthenes was born around 276 B.C., which is now Shahhat, Libya. He studied in Athens at the Lyceum.Jun 21, 2006
This Month in Physics History - American Physical Society
https://www.aps.org/publications/apsnews...istory.cfm
The first person to determine the size of Earth was Eratosthenes of Cyrene, who produced a surprisingly good measurement using a simple scheme that combined geometrical calculations with physical observations. Eratosthenes was born around 276 B.C., which is now Shahhat, Libya. He studied in Athens at the Lyceum.Jun 21, 2006
This Month in Physics History - American Physical Society
https://www.aps.org/publications/apsnews...istory.cfm