My question arises from how to treat navigation within an unknown star system, based on what is in that star system. System North and South can be easy to determine - just observe the directions in which the planets rotate, and use convention - our own solar system - as a guide.
But how do you determine the zero point in terms of rotational/angular distance along the plane of the solar system? My first thought was to use the core of the galaxy as the “zero degree mark”, but some solar systems can have either their North or South “poles” pointing directly at the galactic core. You can’t always assume a solar system will be somewhat edge-facing the galactic core. So without a workaround for edge cases (har, har), this wouldn’t be appropriate in 100% of all cases.
And unlike our own solar system, the constellations would be somewhat to radically different in this new solar system, so you would be unable to use the constellations as a positioning system for where the planets and other ships are currently located.
So I am curious if there is a sol-independent, constellation-independent way of GPS-ing an entire solar system just based off of what it is in it. I am looking for a way that any sentient visiting a brand-new system could quickly set up a way of referencing distances and positions within that solar system in ways that anyone else using the same set of system-independent rules can come to the same determination without having to communicate with each other ahead of time.