The globe theory claims very specific measures for the ball so it should be easy to prove it. And yet we see too far - a recent observation showed Crete from Israel (almost 1000km). Impossible if the surface has to curve to meet the "official" radius.

It used to be that everyone could "see" the supposed curvature, even without looking aids - by observing boats dissappear bottom up after ~5km away. Nowadays, high priests like NDG Tysson claim you cannot observe it even from hundreds of miles in the air. Convenient, as we now have access to technology with which we can easily falsify the theory.