Galactic quadrant

The Sun is used instead of the Galactic Center for practical reasons since all astronomical observations (by humans) to date have been based on Earth or within the Solar System.

Based on a view from Earth, one may look towards major constellations for a rough sense of where the borders of the quadrants are:[5] (Note: by drawing a line through the following, one can also approximate the galactic equator.)

A long tradition of dividing the visible skies into four precedes the modern definitions of four galactic quadrants.

The Canadian Galactic Plane Survey (CGPS) created a radio map of the Galaxy based on Star Trek's quadrants, joking that "the CGPS is primarily concerned with Cardassians, while the SGPS (Southern Galactic Plane Survey) focuses on Romulans".

As the capital planet of the Republic and later the Empire, Coruscant is used as the reference point for galactic astronomy, set at XYZ coordinates 0-0-0.

Longitudinal lines of the galactic coordinate system .
Numbered quadrants and sectors of constellations.
Quadrants as starcharts , with most prominent stars marked.
Galactic quadrants (NGQ/SGQ, 1–4) indicated vis-a-vis Galactic poles (NGP/SGP), Galactic Plane (containing galactic centre) and Galactic Coordinates Plane (containing our sun)
Constellations grouped in galactic quadrants (N/S, 1–4) - this image depicts as a hollow concave face
Constellations grouped in galactic quadrants (N/S, 1–4) - their approx divisions vis-a-vis celestial quadrants (NQ/SQ)
Orientation of the galactic, ecliptic and equatorial coordinate systems , projected on the celestial sphere .
The Milky Way Galaxy
The Milky Way Galaxy