Greenwich meridian
Zero degrees longitude
The Greenwich meridian is the line of longitude at zero degrees, passing through Greenwich, England, from which all other longitudes are measured east or west.
It serves as the basis for coordinated universal time and divides the Eastern and Western Hemispheres.
Also called the prime meridian.
- latitudeGeographic or personal freedom
- longitudeEast-west angular distance
- British EmpireVast colonial domain
- solar timeTimekeeping by sun position
- standard timeRegional clock convention
celestial sphere · nautical mile · chronometer · ship navigation · coordinate system · epoch · map projection · world map · atomic clock · sextant · time zone · geodesy · hemisphere · declination · astrolabe · compass rose · Royal Observatory · nadir
geographic coordinate type
Greenwich meridianequator
Midpoint circle of rotation
parallel · Tropic of Cancer · Tropic of Capricorn · Arctic Circle · Antarctic Circle