And when I say that the course of the sun is theory, it's possible that the sun we see is just something reflecting off the firmament, or the interaction of some other radiation on the firmament. Some FEs hold that the actual sun is above the firmament, and the firmament actually reflects or amplified it down on the earth. They have made these models with a glass dome over the top of the flat plane of earth and then shine a very small flashlight off of it, where the light distribution appears to match that of the sun.
This video is very interesting: