Bearings in space

[Lord Carnifex]

We may have wandered from the original question, though. My 3e GURPS Space (Steve Jackson and William A. Barton, (c) 1988) says

Originally Posted by GURPS Space, p.98

...the direction from Sol to the Core is defined as Galactic North. Galactic Up is arbitrarily defined; if an observer is "above" the Milky Way, the arms go counterclockwise as they spiral outward from the core.

Is this in the new edition of Space? And are these terms used in rela world astronomy, does anyone know?