As the United Kingdom grew into an advanced maritime nation, British mariners kept at least one chronometer on GMT in order to calculate their longitude from the Greenwich meridian, which was by convention considered to have longitude zero degrees ( this convention was internationally adopted in the International Meridian Conference of 1884 ).

By convention, one of these, the Prime Meridian, which passes through the Royal Observatory, Greenwich, England, establishes the position of zero degrees longitude.

In 1884, the International Meridian Conference adopted the Greenwich meridian as the universal Prime Meridian or zero point of longitude.

The Royal Greenwich Observatory, in South East London, is the defining point of the Prime Meridian.

* The International Meridian Conference of 1884 in Washington DC, establishing the Greenwich Meridian, the world time zone system and the universal day as international standards

* October – International Meridian Conference in Washington, D. C. fixes the Greenwich meridian as the world's prime meridian.

The Prime Meridian passes the western edge of the Dome and the nearest London Underground station is North Greenwich on the Jubilee Line.

It is a modern continuation of Greenwich Mean Time ( GMT ), i. e., the mean solar time on the Prime Meridian at Greenwich, and GMT is sometimes used loosely as a synonym for UTC.

The local time at the Royal Greenwich Observatory in Greenwich, England was chosen as standard at the 1884 International Meridian Conference, leading to the widespread use of Greenwich Mean Time to set local clocks.

Since Maskelyne's observations and calculations were made at the Royal Greenwich Observatory, the Greenwich meridian eventually became a common base for longitude worldwide and was adopted internationally as the Prime Meridian in 1884.

The Prime Meridian of these modern reference systems is 102. 5 metres east of the Greenwich astronomical meridian represented by the stainless steel strip.

A line passing near the Royal Observatory, Greenwich ( near London in the UK ) has been chosen as the international zero-longitude reference line, the Prime Meridian.

but also sometimes referred to as the International Meridian or Greenwich meridian.

* 1884-International Meridian Conference adopts Greenwich Mean Time for consistency with Nevil Maskelyne's 18th century observations for the Method of Lunar Distances

It is due north of Greenwich on the Prime Meridian.

Lewes is situated on the Greenwich Meridian, in a gap in the South Downs, cut through by the River Ouse, and near its confluence with the Winterbourne Stream.

The Greenwich Meridian runs through the western part of Lewes, where a pub ( now demolished ) was named after it.

The Western Hemisphere or western hemisphere is mainly used as a geographical term for the half of the Earth that lies west of the IERS Reference Meridian ( which crosses Greenwich, London, United Kingdom ) and east of the Antimeridian, the other half being called the Eastern Hemisphere.

It was placed on high ground along the line of the Greenwich Meridian, but when this was recalibrated later in the 19th century, the obelisk was deemed to have been erected west of the revised meridian line.

Noon Greenwich Mean Time is rarely the exact moment when the sun crosses the Greenwich meridian ( and reaches its highest point in the sky at Greenwich ) because of Earth's uneven speed in its elliptic orbit and its axial tilt.

The ridge of higher ground in South London crosses the Borough from its high point of Shooters Hill, on the boundary with the Royal Borough of Greenwich, to end above the River Thames at Belvedere, where the land drops down to the old port of Erith.

It enters Greenwich Township, where the route crosses County Route 637 ( Liberty Road / North Main Street ) before passing through residential areas.

Continuing east, the freeway crosses into Greenwich Township and has an interchange with CR 607.

Its site coincides with the point where the Greenwich meridian crosses the English south coast.

The Eastern Hemisphere is a geographical term for the half of the Earth that is east of the Prime Meridian ( which crosses Greenwich, England, United Kingdom ) and west of 180 ° longitude.

The Greenwich Meridian line crosses the DLR just to the east of the platforms, and a small trackside sign indicates this.

Route 4 crosses into the town of East Greenwich, passing under South Road before interchanging with Route 2 at exit 6, a partial cloverleaf interchange.

The parade crosses the intersections of Houston Street, Bleecker Street, Christopher Street, and Greenwich Avenue, then ends at 21st Street.

Factoria serves as a commercial center for surrounding residential neighborhoods, such as Eastgate, Somerset, Newport Hills, Newport Shores, Mockingbird Hill, Greenwich Crest, and Woodridge.

Only '' a New York hick would expect to find the literary life in Greenwich Village, at any point, later than Walt Whitman's day.

* Note: Botswana does not have a westernmost point as the western section is formed by the 22nd meridian of longitude east of Greenwich.

If the Earth were perfectly spherical and homogeneous, then longitude at a point would just be the angle between a vertical north-south plane through that point and the plane of the Greenwich meridian.

The longitude shown on maps and GPS devices is the angle between the Greenwich plane and a not-quite-vertical plane through the point ; the not-quite-vertical plane is perpendicular to the surface of the spheroid chosen to approximate the Earth's sea-level surface, rather than perpendicular to the sea-level surface itself.

In celestial navigation, the convention is to measure in degrees westward from the prime meridian ( Greenwich hour angle, GHA ), the local meridian ( local hour angle, LHA ) or the first point of Aries ( sidereal hour angle, SHA ).

With neighbouring Greenwich Park, Blackheath is also well known as the start point of the London Marathon.

Again, due to errors on the Mitchell Map, Treaty of Paris reads "... through the Lake of the Woods to the most northwesternmost point thereof, and from thence on a due west course to the river Mississippi ..." With the border clarification established by the Anglo-American Convention of 1818 defining the boundary about Lake of the Woods to the Rocky Mountains, this treaty reaffirmed the border and further detailed the border by modifying the border definition to instead read as "... at the Chaudiere Falls, from which the Commissioners traced the line to the most northwestern point of the Lake of the Woods, thence, along the said line to the said most northwestern point, being in latitude 49 ° 23 ′ 55 ″ north, and in longitude 95 ° 14 ′ 38 ″ west from the Observatory at Greenwich ; thence, according to existing treaties, due south to its intersection with the 49th parallel of north latitude, and along that parallel to the Rocky Mountains ..."

Taylor had been experiencing financial difficulties in the last few years of his life, and legal entanglements over the Durham and Greenwich forges dragged on until 1799, at which point his estate was judged insolvent.

In 1851 Sir George Airy established the Royal Observatory, Greenwich, London, as the location of the prime meridian where longitude is defined to be 0 ° ( the point that divides the Earth into the Eastern and Western Hemispheres ).

The Greenwich Meridian passes through the point where the bypass meets the original A505 alignment.

The staggered platforms are on the London Bridge to Greenwich railway viaduct, a high brick viaduct on which the line runs at this point, above High Street, Deptford.

The Almanac specifies for each whole hour of the year the position on the Earth's surface ( in declination and Greenwich hour angle ) at which the sun, moon, planets and first point of Aries is directly overhead.

The Pulkovo Meridian, which passes through the center of the main building of the Observatory and is located at 30 ° 19, 6 ‘ east of Greenwich, was the point of departure for all former geographical maps of Russia.

With Shane claiming himself to be a fighting champion, he agreed to a rematch at WrestleMania but regularly interfered in X-Pac's matches up until that point culminating in a Greenwich Street Fight on March 22 that ended in a no contest when the Mean Street Posse ambushed X-Pac and drove off with Shane in their car.