Here is a simple experiment to show whether the earth is flat, or if it is round.
Flat Earth
East is always counter-clockwise around the north pole. This is always the case.
Round Earth
East is counter-clockwise around the north pole above the equator. East is clockwise around the south pole below the equator.
Experiment
Navigate east along the Antarctic coasts. If you are turning left, you are on a flat earth. If you are turning right, you are on a round earth.