The Sun, Moon, stars, planets and rainbows are all reflected projections off of the domes mirrored surface.
Wait, so if the sun and moon are reflected projections off the dome, then where are they actually located? If they are rotating inside the dome at an altitude of 5,000 miles and they are also reflecting off the "mirrored surface" of the dome, then wouldn't we always see two suns and two moons? Kinda like if you hold a flashlight in front of a mirror, you have the actual flashlight and the reflection of the flashlight both visible at the same time.
If you check out my example holographic projector (time traveler game) you can see there's no issue with double images. Also I suspect the dome is only 3,000 miles high.
Where is the projector(s) located? I have my suspicions but I need more information before I make any claims.