I havent heard any ad hominens so far today as far as flat earth goes

https://www.businessinsider.com/how-greek-eratosthenes-calculated-earth-circumference-2016-6?r=US&IR=T

Eratosthenes had heard that in Syene, a city south of Alexandria, no vertical shadows were cast at noon on the summer solstice. The sun was directly overhead. He wondered if this were also true in Alexandria.

So, on June 21 he planted a stick directly in the ground and waited to see if a shadow would be cast at noon. It turns out there was one. And it measured about 7 degrees.

Now, if the sun's rays are coming in at the same angle at the same time of day, and a stick in Alexandria is casting a shadow while a stick in Syene is not, it must mean that the Earth's surface is curved. And Eratosthenes probably already knew that.

did not know that

Ok guys, I'm gonna smoke a joint. its been interesting to say the least. all the best