Ships disappearing bottom first would certainly not offer a global argument.
Ships disappearing bottom first would offer a horizon (theoretical) line perspective that will slowly lose the reflected light from the ship back to your eyes and leave everything above with more reflected light until distance scuppers that too.
This is why you lose a ship over distance and is why you can bring it back with a telescope because it offers you a magnified vision that your naked eyes lost.
If that ship were on a globe, for one there would be no water for a ship to sail on. However, we will go with the magical mystery of water on a ball.
So that being that you can look at a ship going over a convex curvature and every angled tilted down movement forward of that ship offers yourself an angle downward tilt backward with your standing vision of it.
This means you would get to see none of what you actually do see in reality.
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