The horizon should be limitless, then. One should be able to stand on top of Mount Everest and see Los Angeles with a telescope. Or Sydney. New York. London. One should be able to see Antarctica. Hell, according to the flat earth models I've seen, the Sun should be visible from any sufficiently high position on the earth. The earth is massive -- the naturally rugged topography hides a curvature so small that the human eye can't observe it with a passing glance. But from an elevation, it's a little more obvious. How is this flat earth formed? A half-sphere with a distinctly flat surface is not a naturally appearing shape. A flat earth cannot explain many other things. Plate tectonics. How is that explained? Hurricanes that rotate in opposite directions on opposite sides of the equator -- hurricanes shouldn't even exist at all because the Coriolis force would be non-existent. Gravity. Flat earth can't explain that either, or the tiny sun and moon would be cataclysmically embedded in our planet by now, but without gravity, we wouldn't have an atmosphere. The sun. How does it produce heat? It would be far too small to initiate fusion in its core. Why does it rise and set? Flat earth models would seem to show it simply tracking across the sky and eventually fading into the distance as nighttime approaches. Eclipses. Why do those happen? Many of these have been "patched" with bandaid solutions that come apart at the slightest pricking. The entire theory is based in conspiracy. (ask me how many times I've heard the term "NAS-hole" thrown around) It has no basis in modern science and provides no reason for us to abandon modern science in its favor.