Really? Because you just made a huge blunder:
Eratosthenes’ experiment wouldn’t have worked, unless he thought the world was a sphere.
Eratosthenes didn’t just theorize that the world was round, he tested it.
He was trying to find out why a shadow at high noon in the North of Egypt (in Alexandria), wouldn’t appear in a town in the South (Syrene) at the same time.
Thus, the world could not be a flat plane. The surface had to be round.
No, he was pretty accurate. That’s part to why Eratosthenes is such an impressive figure.
He knew the sun cast a 7.2 degree shadow at high noon in Alexandria, he then had someone measure out the distance between the two cities, then he used the quotient of 7.2 degrees over 360 degrees to find out how much that distance could constitute the whole circumference of the earth.
That quotient was 1/50. Alexandria was 800 km from Syrene, so, 800*50= 40,000km.
He of course didn’t use km, what he used was a measurement called stadia. Experts say he was only about 1% off.
Mathematics Dave. Powerful stuff if you know what you’re doing, and Eratosthenes clearly did.
I’m an Engineer (in training)… I honestly had to learn this story while taking Trigonometry. What surprises me, is that you never learned this yourself, and then pretended to know what you’re talking about.
You just willfully dug your own grave, when just watching the video I posted would have told you who Eratosthenes was, and what he did.
Never underestimate the Greeks Dave, that was your first mistake. Your second was continuing the pretense.