Brother, your examples will happen on a flat and globe earth model. You're arguing with what you "see", without understanding a basic principles of distance, that as something gets further and further away it merges into the horizon (in our 2D field of view)
Just because something "visibly" does something doesn't mean that it does. As things get further and further away, all things converge towards the horizon, until our eyes cannot see anymore. Look down a long street, the tops of houses will converge into the horizon, as well as the bases of lamp posts.
Pro-Tip: A powerful telescope would bring those houses back into view, even the ones that should be hidden by the "curvature of the earth".
Again time zones work in a flat earth model. The sun is just at a location where it is now closer to your friend than you.
Brother, your examples will happen on a flat and globe earth model. You're arguing with what you "see", without understanding a basic principles of distance, that as something gets further and further away it merges into the horizon (in our 2D field of view)
Pro-Tip: A powerful telescope would bring those houses back into view, even the ones that should be hidden by the "curvature of the earth".