- Star Trek: The Motion Picture
- Star Trek II: The Wrath of Khan
- Star Trek III: The Search for Spock
- Star Trek IV: The Voyage Home
- Star Trek V: The Final Frontier
- Star Trek VI: The Undiscovered Country
- Star Trek Generations
An astrographic organization al system devised for the Milky Way Galaxy by the UFP and the major neighboring stellar governments, using once again the alphabet of Earth's ancient Greeks. The quadrants make up one-fourth each of the great plane of the galaxy when viewed from "above" as a circle or clockface. Using the imaginary axis drawn through the galactic center, the first boundary of the four 90-degree "crosshairs" is defined as a line drawn from the axis outward through the Sol system, widened into a full plane perpendicular to the galactic equator. The resulting configuration, when viewed as a 20th century Terran clockface, leaves the Alpha Quadrant lying between "6 o'clock" and "9 o'clock," the Beta between 3 and 6, the Gamma between 9 and 12, and the Delta from 12 to 3. Federation science knows the most about its home quadrant, Alpha, with Gamma and Delta the least known — until the opening of the Bajoran wormhole to the former and the once-lost U.S.S. Voyager's mission logs about the latter.