Also, people have been observing ships disappear hull-first in the distance since literally the first ship that ever sailed (Noe's Ark?). The assertion that lower part of the ship becomes visible through a telescope or telephoto lens is absurd because an optical lens does not enable the viewer to see an object that was previously obstructed from view by another object. Lenses don't work that way; they don't change the nature of what someone is looking at, all they do is increase the size of what is already visible to the viewer. And the hull of the ship is obstructed by the surface of the water. No lens could enable a person to see through that obstruction.
Your explanation actually proves FE. It can and has been demonstrated repeatedly that ships that SEEM to disappear from view can be brought back into view simply by zooming in on them. And your explanation is PRECISELY why zooming in bringing the objects back into view demonstrates that they were not obstructed by the horizon. If they had been, they could not be brought back into view, ergo, they were not hidden by the horizon.
You clearly demonstrate that you haven't looked at any of the evidence but have already made up your mind and are now pulling stuff from your posterior to back it up. You haven't seen the myriad demonstrations showing ships "disappearing" from bottom up over an alleged horizon only to be brought back into full view by zooming in on them.
People who "observed" these things in "ancient times" didn't have the benefit of modern optics.
Of course, this doesn't even address the contradiction of those who claim (earlier on this thread) that no curvature would be visible even from 120,000 feet because you have to be hundreds of miles up before you could see curvature. And yet I guess you CAN see curvature from right on the surface.
Basically, when people see things that confirm their prior belief in Globe earth, then it's proof of Globe earth. When they see something that contradicts Globe earth, then it's false, even though it contradicts the proof they just made two minutes earlier.
Massive intellectual dishonesty on this question.