Re: Celestial Navigation in the sim, there is a sim called X-Plane by Laminar Research that not only has global scenery (accurate to within a few meters) it also contains the full night sky. Star positions are accurate and displayed. However, celestial navigation is not possible, though had been requested for trans-Pacific and trans-Atlantic flights based upon vintage aircraft instruments and the use of a aeronautical sextant.
The positions of the celestial bodies pose no problem, it is all the other factors required that make it currently out of reach for a sim.
Regards,
Captron