Sorry if I have missed it: just what was it you "have done"?SeventyOne said:Yes, I have. I've done what I've said, and there is no curve.
Erathosthenes didn't set out to prove the earth was round. He accepted that as a given, as well as the "far away" sun, based on other calculations and experiments done previously by other people.It's cute you thing Eratosthenes was proof of anything. Not even Neil Degrasse Tyson believes that (see video), or actually anyone who thinks about it clearly for a few minutes. It's primary flaw is quite obvious.
What he did try to establish was the circumference of this round earth... and he did that to a degree of exactness that all other different experiments have more or less confirmed.
What your cute little video tries to claim - and fails - is that because Erathostenes didn't use a third measurement to verify his "round earth" hypothesis, his experiment is invalid. The problem with this - the "primary flaw" - is that this experiment is very easy to repeat, especially with our modern means of communication.
And the results are incompatible with a flat earth with a close sun.