Prompted by a letter to the editor in this morning’s Austin American-Statesman, using only equipment or observations easily obtained by an ordinary person on the surface of the planet, how can it be proved that the Earth orbits the sun?
The letter-writer’s hypothesis is that we all live by faith. He knows that the Earth orbits the sun, but since he cannot observe this phenomenon directly, he takes it on faith. Therefore, he has faith in other non-observable things, such as a promised after-life. I think his premise is flawed and that the fact that the Earth orbits the sun can be observed. However, I am struggling to think of how. Any thoughts?