Build a balloon with a camera and launch that sucker into space. Here's some interesting links to get you started. https://qz.com/501461/watch-a-gopro...urns-with-extraordinary-grand-canyon-footage/ http://www.popularmechanics.com/flight/how-to/a6568/how-to-launch-a-camera-into-space/ https://www.bikewrappers.com/2016/03/04/how-to-send-a-weather-balloon-into-space/ Seeing isn't believing, or you don't want to go that far? Study some rocket science. It is vital for a rocket scientist's work to include the curvature of the Earth in their calculations. I want to see people proving or disproving the shape of the Earth using the scientific process.
https://www.nofap.com/forum/index.p...-theory-flat-earth.153297/page-8#post-1278526 Check post 144, the earth is fl—ROUND. Confirmed. Fish eye lens, picture of earth in both frames, in space and close to ground from same balloon in same positions, of course the space one is more straight, therefore proving the earth is indeed, round.
Yeah, I saw that post. But people can come up with any excuse that they want to "disprove" the facts. So I say to do your own experiments until you get results. If a flat earther can't believe their own camera sent into space, using mathematical equations based on the curvature and rotation of the Earth to determine where it will come back down at, I'm not sure what will convince them aside from going up there themselves.