Yes ships appear to go over the curvature at the horizon but in reality they are just so far away that they disappear. Do you believe everything your eyes show you? It's just an illusion. You can still debate what shape the earth is and still do meaningful work .We all know that ships disappear over the horizon, that couldn't happen if it were flat. But I immediately regretted replying to this thread because I truly believe the flat earth theory is a psyop. Let's argue over the shape of the earth instead of actually doing things that are meaningful in our lives. Having a purpose and doing meaningful work is very important for a healthy society.