Which is an unlikely coincidence, especially since -- as I said -- it's a completely arbitrary and generally useless way of subdividing the galactic disk. And different cultures that did happen to divide it into quadrants would not pick the
same quadrant dividing lines, certainly not ones based on Sol as the anchor point. Before the 1884 international agreement to accept the Greenwich Meridian as the global standard, there were a lot of different "
prime meridians" used by different countries.
I think a more useful way of subdividing the galactic disk would be radially, as concentric rings -- the core, the inner disk, the middle disk, the outer disk, the halo. After all, there is a meaningful physical distinction between those regions -- the stars are packed closer together the closer in you get, the cosmic environment is more turbulent and radiation-rich closer in, and many scientists believe that the middle disk represents a "galactic habitable zone" where life is most likely to form (though I prefer to think of it more as a temperate zone, since perhaps life in the inner disk would simply evolve to be hardier and more radiation-resistant, and of course stars can drift from one region to another as they orbit). Of course, that means that two stars could be in the same ring yet on opposite sides of the galaxy, so maybe combining the ring divisions with a quadrant or octant system would help a bit, although that would still make each segment extremely huge and in need of finer subdivisions within it.