Z plane

The Z Plane or the Z Axis is part of the Cartesian coordinates in three dimensions. For purposes of Astronavigation coordinates are given on a Cartesian Coordinate system plus a time value.

The Old Terran Coordinate system used : Galactic North, Galactic South, Galactic East and West for X and Y coordinates and Galactic Up and Down for the Z Axis. These terms are no longer used since United Earth joined the Union.