Our eyes can see far, but not infinitely far. Ships/boats don't disappear behind any curve, there is no curvature because we really don't live on a spinning ball. The ships/boats that disappear out in the distance are simply too far away out in the ocean for us to see them with our own eyes. If you zoom in with a long distance camera or a telescope, you will see them again because the earth is flat.
Edited by italiansandwich, 20 August 2023 - 06:14 AM.



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