My favorite rebuttal is simply Foucault's pendulum[1]. It rotates one way in the northern hemisphere, not at all on the equator, and the other way in the southe

My favorite rebuttal is simply Foucault's pendulum[1]. It rotates one way in the northern hemisphere, not at all on the equator, and the other way in the southern hemisphere. You can't explain this behavior on a flat earth without introducing a force that "just happens" to act exactly like the Coriolis force. A spinning flat earth can't explain why the effect gets less at the equator, and reverses as you cross it. [1] a long long pendulum with a heavy weight