However, proving any information to a flat-earther is nearly impossible if not impossible. If you send one on a rocket into space and tell them to look out the window, they will say the windows are screened/faked with a display. If you put in a spacesuit into space, the glass on the spacesuit or they have been drugged.
So true - but it's fun to explain elementary school knowledge to them and watch them get all upset.
Notaman wants me dead sooooo bad because I keep exposing his lies.
His arguments are literally: ''some sort of effect/illusion'' always renders every measurement, observation useless. There is always some weird effect that always makes it look like the earth is a sphere.