Dalamud has been close to Hydaelyn's moon Menphina for hundreds of years so the distance didn't change until recently (1.21) when Dalamud left it's normal course. Menphina though can't be too far away from Hydaelyn, otherwise it wouldn't be affected by the gravity of Hydaelyn and wouldn't be orbiting the planet.
(And really, just how big would Menphina have to be so we could still see her so big in the sky if she was really far away?

)
I don't know about you, but from what I know those "little bits of meteorite" are extremely dangerous, leading to massive destruction. Not mass extinction, because it will only affect areas and not EVERYTHING, but it would weaken Eorzea a lot, making it easy for Garlemald to invade what is left of it.