Eratosthenes determined the circumstances of earthly conducting

True

Explanation:

Over 1,000 + years ago the Greek geographer Eratosthenes made an amazing accurate measurement of the Earth's circumference. In the great library in Alexandria, he read that a deep vertical well near Syene, in southern Egypt, was entirely lit up by the sun at noon once a year.

This answer helps hopefully! :)

it's actually d for edge-nuity.