I don't deny that refraction exists but I question the mechanics of it as it pertains to a globe. I can't help if people interpret this as proof of a flat Earth, it was never suggested and I tried to be intellectually honest by stating that what we see is not possible on a flat Earth either, without refraction of course. Anyway, since you seem to understand refraction so well, maybe you could show me or make a simple diagram explaining the downward curve of light over a bulge of water?