I would guess, based on the information I've gathered over time and on the wiki, somewhere in the range of 1000 miles or less. Moon being ~2500 above us or more and sun being ~3500 above us or less.
Why your beliefs of the 2500-3000 miles altitude "measurements" could be accurate more than my crazy thoughts of existence of other suns and them having variable heights relatively to periods of days/weeks/months? This is the same types of beliefs as spheroid earth!
Have you checked whether any calculations made are matching with real life observations outside the computer/smartphone screen? At least i can confess i have done it very few insignificant times. Don't start the usual: we all know the the earth is round/flat, because ... - no, i don't know! Why these, useful for world leaders, indoctrinations(both!) are something anyone should know!
I'm sorry for ranting so much,
junker and everyone, i had to say it.
...
I don't have much of the personal
real evidence: only videos and comments on the internet as possible clues and hints.
My assumption is that suns also have variable sizes, irradiances, brightnesses, so as the moons and some of the stars, and, mine most crazy one - planets. I was perhaps wrong about quantity of suns: it's less than 50!
Almost all the sky objects, if not all, are definitely artificial. These objects presumably are working because of highly-advanced holographic shells(disc of the sun, face of the moon) with a projector supposedly located within the shell. Don't ask me
yet who made them - i just can't say 'i know', i only have assumptions or retranslations of people's assumptions! But if you want to hear the assumptions, go on.
This is a hypothesis, not a theory yet: from lack of anyone-can-prove-it-with-lowest-budget type of the evidences. I'm only retranslating it, because this information might become(or not) useful someday. Don't throw it in a trashcan!