^^^ You are right about one thing. Ships aren't going up, over and behind the horizon. They are going down and around it with relation to the observer. You prove it by placing your eye, or the camera lens, right at the surface, and looking straight along the the tangent-line, tangent to the globe... 90 degrees from the center-line that goes through the center of the Earth.
Perspective isn't the thing that makes truth. Truth is truth. Perspective is how we observe that truth. In other words, the ship only appears to go up; it is a trick in observation that makes the ship appear to go up. What is this trick? It lies in the parts of the eye/camera/lens that are taking in a lot of extra "footage" besides the tangent line.
If the eye of the observer is at 6 feet high, the tangent line is at 6 feet above the surface of the earth. Only the part of the ship that is at 6 feet high is seen if we remain true to the tangent line. So, essentially, the 6-foot-high part of the ship is at the horizon already, even if the ship is directly in front of the observer. The part of the ship that is above the 6-foot tangent line is above the horizon. The part below the tangent line is below the horizon.
When the ship is right in front of you, why can you see the part of the ship that are below the horizon tangent line? Because the lens of your eye allows light from other levels than 6-feet to enter your eye. When this happens, you are caught up in an optical illusion that says that part of the ship is moving up (even if the ship is not moving at all), and that part of the ship - the part that is above the 6-foot tangent line - is moving down.
Your whole idea of how the horizon observation works is based on an optical illusion. What holds this optical illusion firm for you? An incomplete understanding of the aether. The aether is an orderly thing, that doesn't skew the perspective without skewing the observer in the same way. This makes perspective remain as it always has been in standard observation.
So, then why do you see (understand) things differently about this? It has to do with your mental/emotional perspective... not the physical perspective. For you it might be philosophy/religion. But it could be mental illness. While you still have some sanity left, you should voluntarily have yourself examined by several psychologists and psychiatrists... several, so that you get several second opinions.