Meridian of longitude 0 degrees, used as the origin for measurements of longitude. The meridian of Greenwich, England, is the internationally accepted prime meridian on most charts. However, local or national prime meridians are occasionally used.
The reference line for Longitude in the Lat/Long grid system. All other meridians of longitude are designated in degrees East or West of the Prime Meridian up to 189°. The Prime Meridian is 0° Longitude.
Zero degrees longitude. Runs through the Royal Greenwich Observatory in Greenwich, England. The prime meridian globe into the Western and Eastern hemispheres. The Earth's time zones are measured from the prime meridian. The time at 0° is called Greenwich Mean Time (GMT) or Universal Time (UT).
The line of latitude assigned a zero value; used as a reference line from which longitude east and west is measured. The Prime Meridian passes through Greenwich, England. Back to the top of the page... Q - S
The line traced out by longitude zero and passing through Greenwich, England. The prime meridian forms the origin for the longitude part of the geographic coordinates and divides the eastern and western hemispheres.
The Prime Meridian, also known as the International Meridian or Greenwich Meridian, is the meridian (line of longitude) passing through the Royal Greenwich Observatory, Greenwich, England, United Kingdom â€” it is the meridian at which longitude is defined to be 0 degrees. The prime meridian, and the opposite 180th meridian (at 180Â° longitude), which the International Date Line generally follows, separate the Eastern and Western Hemispheres. The Prime Meridian and the 180th meridian form a great circle which encircles the Earth like a longitudinal equator.