If I mis-quoted . perhaps a member of the FES could supply a correction.
I am just a "round earth" visitor and this is the way I best remember it.
According to flat earth, both sun and moon are the same size - 32 miles in diameter - and the same distance from the earth - 3,000 miles. They don't bump into each other "because they wobble up and down."
According to one flat earth animation, sun and moon are always 180 degrees apart in their orbits over the earth.
The earth is stationary.....sun, moon and stars rotate.
The sun "acts like a spotlight" and shines down - on the earth- so light from the sun never reaches the moon. The moon is "self-illuminated" by some kind of "bio-luminescent" creatures . Their migrations back and forth across the moon causes the phases of the moon.
At least that is the way I have read it. Please correct me, FES, if this is not corrrct.