so when the sun dies it will 'overtake' the moon. ok. you're not adding you're own spin on this at all are you.
I don't know if you understand what the end of the sun entails... you do know how stars, of which our sun is one, die, right?
o·ver·take /ˌoʊvərˈteɪk/ verb,-took, -tak·en, -tak·ing.
–verb (used with object)
1. to catch up with in traveling or pursuit; draw even with: By taking a cab to the next town, we managed to overtake and board the train.
2. to catch up with and pass, as in a race; move by: He overtook the leader three laps from the finish.
3. to move ahead of in achievement, production, score, etc.; surpass: to overtake all other countries in steel production.
4. to happen to or befall someone suddenly or unexpectedly, as night, a storm, or death: The pounding rainstorm overtook them just outside the city.
Do let us know what you think "overtake" means and how you are assigning it a meaning without making a single assumption yourself (like the assumption that the words mean what they mean in linguistic documentation).
and who's to say God will not call time on the universe before the sun dies anyway?
Yes and unicorns from another planet could descend upon the Earth and block out the sun between now and then too.

and 'they each float in an orbit' proves a geocentric model in the Quran - you're not getting desperate are you? you are making the assumption that the Quran is saying the sun and the moon are going round the earth - surely you accept that??
Nope. The Quran is actually saying that. You are the one who likes to say that you really understand what the Quran "means" to say, denying outright all the things it says that don't fit your own secular humanistic outlook, like denying that it says there'll be eternal torture for "disbelievers", apostates etc.
You make a lot more assumptions than most of us who are willing and able to look at the hard reality of the Quran, that it is false and to make it fit into your and our *more moral* outlook, we have to deny too much of what it *actually* says.