The prime meridian is also used as the basis for the world’s time zones.

1 "A New and Correct Map of the Coast of Africa". Measured also in degrees, minutes, and seconds, longitude is the amount of arc created by drawing first a line from the Earth’s centre to the intersection of the Equator… Greenwich Mean Time is the mean solar time at the Royal Observatory in Greenwich, London, reckoned from midnight. Prime Meridian at Greenwich, London is the reference for every time zone in the world.. UTC is rectified every few years with leap seconds so that UTC never drifts further than two seconds away from GMT.. For most practical purposes, you can consider UTC and GMT as the same time.. Greenwichmeantime.com is now a web application.Navigation between pages is fast, and data …

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At first though, Greenwich time was only really important to astronomers.

If one uses directions of East and West from a defined prime meridian, then they can be called the Eastern Hemisphere and the Western Hemisphere. It is known as Greenwich meridian, but also zero meridian, base meridian or first meridian, the imaginary vertical line that divides the world map into two identical halves and from which the lengths are measured.

Such is the Meridian's fame that each year, hundreds of thousands of visitors from all around the world make their way to the Observatory to stand astride the Line. These meridians are theoretically the centres of 24 Standard Time zones, although in practice the zones often are subdivided or altered in shape for the convenience of inhabitants; a notable example of such alteration is the eastward extension of the International Date Line…

This was Greenwich Mean Time, or the average time when the Sun crossed the meridian at Greenwich. Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. The plane of the prime meridian is parallel to the local gravity vector at the Before the establishment of a common meridian, most maritime countries established their own prime meridian, usually passing through the country in question. On this website, you will find details of those places where the Meridian is known to have been marked, together with sequences of pictures that have 'frozen' them in time.

Der Nullmeridian ist derjenige Meridian (ein senkrecht zum Erdäquator stehender und von Nord- zu Südpol verlaufender Halbkreis), von dem aus die geografische Länge nach Osten und Westen gezählt wird.

It was created to standardise navigation and also to establish relative time zones. But its position is marked in hundreds of other places too. The Greenwich meridian also serves as the basis for the world’s standard

In this sense, the equator would be the zero parallel or base parallel, whose circular shape traces the earth’s circumference in the tropics.The equator crosses the territories of Ecuador (whose name comes precisely from that line), Colombia, Brazil, Sao Tome and Principe, Gabon, Republic of the Congo, Democratic Republic of the Congo, Uganda, Kenya, Somalia, Maldives (although not by its islands), Indonesia (the islands of Sumatra, Borneo, Celebes and Halmahera) and Kiribati.The regions in which the parallels divide the earth from the equator are known as climatic strips, and mark the beginning and the end of the tropical, temperate and polar areas of the planetLatitude and longitude cross the Earth from north to south and from east to west.the components of the navigation system coordinates of the planet Earthcross the globe from north to south and from east to west , sectioning the surface of the planet in a regular grid, whose base axes are the Greenwich meridian (longitude 0) and the equator (latitude 0).Using latitude and longitude, the Geographic Coordinates (latitude, longitude) of a given point on the planet’s surface can be assembled, for example: Spain is located at coordinates O 4 °, 0’00 ”(West four degrees, zero minutes , zero seconds) long and N 40 °, 0’00 ”(North forty degrees, zero minutes, zero seconds). The prime meridian is a geographical reference line that passes through the Royal Observatory, Greenwich, in London, England. The Greenwich Meridian (or prime meridian) was not discovered, it was invented/established.

Except where indicated, all text and images are the copyright of Graham Dolan.

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