I was in the USN, CINCPAC. It was always an intriguing sight to see a large ship sailing away from yours. As it moved farther away, it'd begin to sink over the horizon, its masts & superstructure being the last to go. It's the opposite when a ship approached yours.
I went up in a chopper several times to practice water rescue & treating a patient aboard a chopper in cramped conditions. When the chopper gained altitude, we could see the other ships in our squadron that were outta sight at sea level.
The horizon line at sea near the water's surface is between 26 & 27 miles. One can see the tall parts of a large ship when it's some 30 miles away.
And a jetliner flight should end all doubt about a round earth. One can see out the window & know the window doesn't curve or distort incoming light, and see the curvature of the earth as the plane reaches cruising altitude.
And, of course, the atmosphere rotates at the same speed as the planet itself. If the earth's rotation were suddenly stopped, the atmosphere & all unattached objects, including us, would continue on at the earth's former rotational speed, most likely being slammed into a mountain, etc. at over a thousand MPH!