Ugh you understood me. We proove it 2200 years ago and nowadays we are photos!
And the problem with gravity is that (by Newton logic logic which works on planetary scale) it attract everything around a "center of mass". Which leads to big amalgamation of mass to regroup around a point. Which, in our 3D world, mean a sphere.
Also how tf the sun and the moon just float and eclipse happens on flat earth? Like is it literal magic or....