Prime meridian (Greenwich) - Wikipedia
The Greenwich meridian is a prime meridian, a geographical reference line that passes through the Royal Observatory, Greenwich, in London, England. [1] From 1884 to 1974, the Greenwich meridian was the international standard prime meridian, used …
Greenwich meridian | Definition, History, Location, Map ...
Greenwich meridian, an imaginary line, last established in 1851, used to indicate zero degrees longitude. It passes through Greenwich, London, and ends at the North and South poles. Because it indicated zero degrees longitude, it was also known as the prime meridian.
What is the Prime Meridian - and why is it in Greenwich?
The Prime Meridian in Greenwich is marked by a metal line fixed into the Royal Observatory courtyard, and at night by a laser beam. The beam originates from a point above the Airy Transit Circle, the telescope used to determine the Greenwich Meridian.
Stand on the Prime Meridian Line - Royal Museums Greenwich
Since 1884, all distances east and west have been measured from the Prime Meridian line in Greenwich. Astronomers at the Royal Observatory took thousands of measurements to define the Prime Meridian and establish zero degrees longitude.
The Meridian Line - The Royal Parks
The meridian line in Greenwich represents the Prime Meridian of the world, Longitude Zero (0° 0' 0"). Every place on the Earth is measured in terms of its angle east or west from this line. Since 1884, the Prime Meridian has served as the reference point for Greenwich Mean Time (GMT).
Greenwich Meridian (Prime Meridian) - GIS Geography
The 0-degree line of longitude that passes through the Royal Observatory in Greenwich, England is the Greenwich Meridian. It’s also called the Prime Meridian. This line is the starting point for longitudinal lines that run north-south and converge at the poles.
Prime meridian - Wikipedia
A prime meridian is an arbitrarily chosen meridian (a line of longitude) in a geographic coordinate system at which longitude is defined to be 0°. Together, a prime meridian and its anti-meridian (the 180th meridian in a 360°-system) form a great circle.