Einstein exposed.
(media.scored.co)
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On a flat earth, objects don't disappear behind a horizon. If you move away from CN Tower, it would keep getting smaller and smaller. On a spherical earth, the CN tower would start disappearing bottom-up and getting smaller.
Perspectives don't cause things to disappear. The "mountain" growing between you and the CN tower is what is obstructing the view. The "mountain" is the curvature of the Earth.
"after about 100 feet, you will notice their feet aren't visible."
As his feet get smaller it's hard to distinguish them from the ground. Use binoculars, and you will have no problem.
A horizon only exists as block in the field of vision. For example, I can't see my neighbors house because of the fence between us. To see the house, I raise my self on a chair, and force the horizon to be LOWER.
On a flat earth, with flat topography, the horizon and the infinite point are the same thing.
Nothing would dip below the horizon, because there is no obstruction.
Perspective does not cause dipping below a horizon.
On a spherical earth we'd expect a "mountain" to form between you and an object you are moving away from. This mountain is the curvature of the eartg. The top of this mountain is called the horizon. As you move away from object, the mountain grows, obscuring the bottom of the object.
The reason I can't see Paris from my house is because of this mountain. Slice this obscuring section off the Earth, and I'll see Paris with a good enough telescope.
Literally doesn't. You saw a picture of CN Tower already using optical enhacement. There is no return of its base.
You can't see past the mountain of water between you and CN Tower.
Only refraction can help, but it's very slight.
You calling Magellan a liar?