I haven't played dawnguard still but I understoodf that at some point in the quest the sun becomes dark ... now my question is how to manage other lands?

I mean if I make my island mod and the player is playing at the same time Dawnguard , will also the sun in my mod become dark? or it woudl look shiny?

it woudl look weird if the sun in my land looked not different from the dawnguard one if player plays it ....

Up!