The Earth is Flat and Motionless.
Then why do the bottom of the buildings appear to be lower than the horizon? Because of curvature that's why.
Nope. If that would be the case you should also see the curve on x axis, and you clearly do not.
Refraction and magnification - there is no curvature: https://www.youtube.com/watch?v=I-Q-FuXJSTQ