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en.wikipedia.org/wiki/Prime_meridian_(Greenwich)

A prime meridian, based at the Royal Observatory, Greenwich, in London, England, was established by Sir George Airy in 1851. By 1884, over two-thirds of all ships and tonnage used it as the reference meridian on their charts and maps. In October of that year, at the behest of US President Chester A. Arthur, 41 delegates from 25 nations met in Washington, D.C., United States, for the ...

www.britannica.com/place/Greenwich-meridian

Greenwich meridian: Greenwich meridian, imaginary line used to indicate 0° longitude that passes through Greenwich, a borough of London, and terminates at the North and South poles. An international conference held in Washington, D.C., in 1884 designated “the meridian passing through the centre of the transit

www.rmg.co.uk/discover/explore/prime-meridian-greenwich

The Royal Observatory in Greenwich is where east meets west at Longitude 0°. Visit the Prime Meridian Line. What is a meridian? A meridian is a north-south line, selected as the zero reference line for astronomical observations.By comparing thousands of observations taken from the same meridian it's possible to build up an accurate map of the sky.

www.reference.com/science/greenwich-meridian-f657acf27cfa0c42

The Greenwich Meridian, or prime meridian, is the imaginary line that runs through Greenwich, England, and it is designated as 0 degrees longitude. This line is used as a starting point for measuring the lines of east and west longitude, and it helps create the Eastern and Western Hemispheres. It was chosen as the standard in 1884 at an ...

en.wikipedia.org/wiki/Greenwich_Mean_Time

Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London, reckoned from midnight. ... Indeed, even the Greenwich meridian itself is not quite what it used to be—defined by "the centre of the transit instrument at the Observatory at Greenwich".

www.rmg.co.uk/discover/explore/greenwich-mean-time-gmt

The historic Royal Observatory is the home of Greenwich Mean Time. Enter the Meridian Courtyard to get your essential photo standing on the Meridian Line and explore some of the oldest parts of the site including the Astronomer Royal's house. The Royal Observatory is open daily, 10am-5pm. Book your tickets

www.timeanddate.com/geography/prime-meridian-wrong.html

Is the Greenwich Meridian in the Wrong Place? A GPS device does not show 0 degrees of longitude on the line marking the prime meridian at the Royal Greenwich Observatory in London, England.

gisgeography.com/prime-greenwich-meridian

This is why prime meridian is also known as the Greenwich Meridian. In a geographical coordinate system, the Greenwich Meridian (or prime meridian) is the 0° line of longitude from which we measure 180° to the west and 180° to the east. Most coordinate systems define a zero line at the equator that runs east-west.

greenwichmeantime.com/what-is-gmt

Greenwich Mean Time or GMT is clock time at the Royal Observatory in Greenwich, London. It is the same all year round and is not affected by Summer Time (Daylight Saving Time) clock changes. When the sun is at its highest point exactly above the Prime Meridian , it is 1200 noon at Greenwich.

thegreenwichmeridian.org

Where east meets west. The Greenwich Meridian separates east from west in the same way that the Equator separates north from south. Inextricably linked with Greenwich Mean Time, it also sits at the centre of our system of time zones.