Enjoying a beautiful sunrise on the beach this morning. All my observations of the sunrise tell me that the Earth is round and rotating; That model, fits perfectly with what I am seeing.
But, there are other observations that I can make here. I can go to a website and find the exact time for high and low tide. The calculations are all based on the Earth and moon being spheres, and the positions of the two relative to each other. I can see plainly that the predicted times for high and low tide are correct.
With a flat Earth model, how can these tides be predicted, and in fact, how do these tides happen at all?