Just for the sake of argument, there's no reason it couldn't have been the same site, and even the same building as the "Watch Tower". Maybe in the BSG universe, this "Watch Tower" eventually gets renamed/retasked to be the "Temple of Aurora" some number of years from now, and it's only well after that (and whatever holocaust took place) that the Galactica arrives.
See my post #46. The “Temple of Aurora” co-exists today with the WatchTower building!