Weirdly, I couldn't find a similar question already asked. If it has, please forgive me!
The 'easy' answer is three celestial bodies are needed to navigate a spaceship in space. Position + Brightness triangulates location. I'm looking for precision to... let's say figuring out A) what solar system I'm in, and B) where I am relative to my "home" solar system. Pretend the home star is dim enough that it's easy to lose in the "wash"
Except... what happens when two of them are lined over each other? When one is hidden behind another object? When two are overlapping and a third is hidden?
Pretend for a second we're dealing with a system that wants to be able to orient with no 'backtracking' so to speak - no "well, we were at X position A years ago going in Beta velocity" to eliminate possibilities - more on the "We just came out of a wormhole, where the heck are we?"
Do we need to have 5 celestial objects to always orient towards? 6? Where's the sweet spot of the fewest objects to know, while maximizing the ability to always orient within the same galaxy?
I'd imagine using other galaxies for navigation is optimal... if they can be found. I was thinking "brightest objects in the galaxy" would make for good navigation landmarks, but I just don't know. Hence this question!