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This is a normal post the ancient greeks not only knew that the earth was round
but also knew the circumference!

they did it by digging wells. perfectly straight wells.
in different places. then at the same time they would measure how far the shadow of the well itself went down. from that information they knew the curvature.
(, Tue 14 Nov 2017, 18:13, Reply)
This is a normal post Eristothenes did it with sticks, not wells.

(, Tue 14 Nov 2017, 19:02, Reply)
This is a normal post Cheapskate.

(, Tue 14 Nov 2017, 19:09, Reply)