Galactic coordinates

Galactic coordinates referred to the location of star systems in the galaxy. Every system was located by its XYZ coordinates; X measured the system's "east-west" location, Y measured its "north-south" location, and Z measured its distance above or below the galactic plane. The system was known as the Coruscant coordinates system as it was centered on Coruscant rather than the actual galactic center - Coruscant was dignified with XYZ coordinates of 0,0,0 (Triple Zero in military speak). In the Coruscant system, a parsec was 3.26 light-years, with fifteen parsecs corresponding to one unit on the coordinates scale. A negative number for X, Y or Z coordinates indicated that the star system was west of, south of, or below Coruscant's position.

All starship navigation computers contained XYZ coordinates for billions of star systems.

Text and facts from the “Galactic coordinates/Legends” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.