RE: How Muslims believed earth was spherical long before anybody mentions it.
March 14, 2015 at 5:08 pm
(March 14, 2015 at 4:53 pm)Irrational Wrote: It shows how ignorant the OP is regarding geometry and trigonometry. Had Eratosthenes thought the Earth was a coin (horizontally placed), he could not have been able to estimate its horizontal circumference according to how he did the calculations.
Below is how Erotosthenes did it. It's clear from the method that he was measuring a sphere, as you say.