LOL. What question. You asked the distance to the ship. I answered and gave an example of a distance I actually do know. Perhaps you can't read and that is the problem with they you think the earth is flat. What about that did not answer your question? Because it sounds like YOU are the one ducking reality.
The planes are landing behind the horizon.. but, but, but, things don't GO behind the horizon according to you. Yep, they do. INCLUDING the ships that you say don't go behind the horizon. Sorry. But they do.
RE: Question : At what height do we see curvature