Question

What unit did Eratosthenes use to measure the Earth's circumference?

• A. Stadia
• B. Kilometers
• C. Miles
• D. Nautical miles

Answer 1

Answer:

A. Stadia

Eratosthenes was the first to determine the circumference of the Earth based solely on the angle of sunlight. He calculated it as 250,000 stadia. A stadia is a unit used to measure distance. Eratosthenes was also the first to use the word "geography."