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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 worldwide for timekeeping and navigation. The modern standard, the IERS Reference Meridian, is based ...
v. t. e. The Ordnance Survey National Grid reference system (OSGB), also known as British National Grid (BNG), [1][2] is a system of geographic grid references, distinct from latitude and longitude, whereby any location in Great Britain can be described in terms of its distance from the origin (0, 0), which lies to the west of the Isles of Scilly.
Longitude by chronometer. Longitude by chronometer is a method, in navigation, of determining longitude using a marine chronometer, which was developed by John Harrison during the first half of the eighteenth century. It is an astronomical method of calculating the longitude at which a position line, drawn from a sight by sextant of any ...
Prime meridian. 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. This great circle divides a spheroid, like Earth, into two hemispheres ...
(Absolute here refers to a time that is the same for an observer anywhere on Earth.) Each hour of difference of local time corresponds to a 15 degrees change of longitude (360 degrees divided by 24 hours). A Transit Instrument from 1793. Local noon is defined as the time at which the Sun is at the highest point in the sky.
Centre points of the United Kingdom. This stake is one of several way markers that mark the location of variously calculated geographic centres of Britain. [citation needed] It is located just to the west of Whitendale Hanging Stones in Lancashire at SD 64188 56541. There has long been debate over the exact location of the geographical centre ...
Geography of the United Kingdom. Mountainous area to the north and west, lowland area to the south and east. The United Kingdom is a sovereign state located off the north-western coast of continental Europe. The United Kingdom is made up of four countries – England, Scotland, Wales and Northern Ireland.
The meridian 15° east of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, Europe, Africa, the Atlantic Ocean, the Southern Ocean, and Antarctica to the South Pole. Wikimedia Commons has media related to 15th meridian east. The 15th meridian east forms a great circle with the 165th meridian west.