prime meridian n. 1.A meridian used as a reference line from which longitude east and west is measured. 2.Prime MeridianThe meridian passing through Greenwich, England, designated as the zero meridian (0°) by an international conference in 1884. ...
prime meridian prime meridian, meridian that is designated zero degree (0°) longitude, from which all other longitudes are measured. By international convention, it passes through the site of the Royal Observatory in Greenwich, England; for this reason, it is sometimes called the Greenwich meridi...
The prime meridian is at 0 degrees longitude, and the international date line is at 180 degrees. The equator is at 0 degrees latitude. So the martian prime meridian, the equivalent of the Greenwich, UK, prime meridian on Earth, has been set to run through this region. Starts to the prim...
ThePrime Meridianis the universally decided zerolongitude, an imaginary north/south line whichbisects the world into twoand begins the universal day. The line starts at the north pole, passes across the Royal Observatory in Greenwich, England, and ends at the south pole. Its existence is purely...
The cone's base is oriented north-south and is parallel to the prime meridian; the northern wall of the cone is vertical and points to the zenith, while its southern wall is tilted 51[degrees] 28' 38" (the latitude of Greenwich) and points to the north celestial pole. Greenwich: center...
The Greenwich Meridian (or Prime Meridian) is a zero degrees longitudinal It is the start-point which we measure 180 degrees east and west.
Meridian, imaginary north–south line on the Earth’s surface that connects both geographic poles; it is used to indicate longitude. The 40th meridian, for example, has a longitude of 40° E or 40° W. See latitude and longitude. The prime meridian is ze
Meridians are used to measure distance in degrees east or west from the prime meridian. The prime meridian is 0° longitude. The 180th meridian is the line of longitude that is exactly opposite the prime meridian. It is 180° longitude. ...