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RE: What Grinds My Gears? Flat Earth Theory.
Sorry, optics dictate that you cant see a curve at that altitude. The horizon needs to drop A LOT before anyone can see a curve. Even at low earth orbit it would be difficult to perceive. Otherwise...we are living on a tube! ;-) (if you see a curve from a plane, you would need to extrapolate that curve over 360 degrees...which doesnt work)
You can't see the whole sphere from 30,000 feet, but you certainly can see the horizon dropping off...into the land of dragons. ;)