A person on Antarctica (any research stationed there) can see 24 hours of sunlight, circling around, during solstice.  Care to explain how it is possible in a flat earth model?  It is pretty simple on spherical planet model.  See below a 360° pictures in Antarctica.



The opposite happens on Arctic, from November 13 to January 29 there is no visible Sun, not even twilight, since it goes 12 degrees below the horizon, during this time the whole Arctic becomes dark for 11 weeks.  Care to explain about that in a flat earth model?

Both are quite simply to explain, including precise math calculation, even predictions, using the spherical planet model.

Below, Arctic 24 hours of sun all around in June, 360° pictures.