> by going out just one whole night and watching the stars rotate around the pole
A flat earth can also spin.
A flat earth can also spin.
[1] Obviously, the sky does not rotate, the Earth rotates.
You would see this from anywhere on the disk, which would not be a problem if you never traveled south of the equator (decent assumption for most of the population).
I'm just putting on the flat-earther's hat for fun.