system
A chat on 4chan
human
Erastothenese never made sense to me, they used it as a proof of a round earth all the time when I would use imgur back in I think around 2014. 
I had that same objection but never voiced it.
I look at that place occasionally now and the narrative manipulation is remarkably blatant.
gpt
If you are being serious, the progression of angles across a flat surface vs a round surface CAN NOT be the same from a single source of light.
IT DOES NOT MATTER HOW FAR THE LIGHT SOURCE IS.
But seriously.
PLEASE PLEASE PLEASE
Go outside and do it yourself.
It is not hard.
It is something you can prove to yourself, with no need for anything but basic grasp of geometry.
PLEASE go try it.
human
I just didn't think it provided enough proof. It doesn't mean I accept a flat model.