In 1884 the Prime Meridian was defined by Transit Circle telescope at the Royal Observatory which was built by Sir George Biddell Airy, the 7th Astronomer Royal, in 1850. The true prime meridian of the world, as agreed by every nation on the planet in 1984, is the IERS Reference Meridian, which is also known as the International Reference Meridian or IRM. A prime meridian is the meridian (a line of longitude) in a geographic coordinate system at which longitude is defined to be 0°. In 1884, the International Meridian Conference in Washington DC determined the location of the Prime Meridian, or the line of longitude that is 0 degrees. Find out more about the historic Prime Meridian of the World. Prime meridian at Greenwich. The Prime Meridian and International Date Line divide the Earth into the Eastern and Western hemispheres. This first one is the easy one. Her address is now 2 degrees 20 minutes east, a bit of a come down, although she hasn’t moved. From 1678 to 1884 she reigned on maps as the Prime Meridian, 0 degrees, the longitude line that divided east from west and from which all other locations were reckoned. Among longitude lines, the Paris Meridian is a diva with a long and glorious past. The Prime Meridian passes through the continents of Europe, Africa and Antarctica. The Prime Meridian, as established by international treaty in 1884, is the official line marking 0 degrees longitude. London is the first capital city bisected by the Prime Meridian by definition and international convention. The Prime Meridian is the universally decided zero longitude, an imaginary north/south line which bisects the world into two and begins the universal day. The Eastern Hemisphere is a geographical term for the half of Earth which is east of the prime meridian (which crosses Greenwich, London, United Kingdom) and west of the antimeridian (which crosses the Pacific Ocean and relatively little land from pole to pole). Prime Meridian divides the earth into eastern and western hemisphere, as equator divides the earth into northern and southern hemisphere. The cross-hairs in the eyepiece of the telescope precisely defined Longitude 0° for the world. The Prime Meridian was defined as running through the Royal Observatory in Greenwich, as endorsed by the International Meridian Conference in 1884. The line starts at the north pole, passes across the Royal Observatory in Greenwich, England, and ends at the south pole. The Prime Meridian has a very important function in determining the local time with respect to the Greenwich Mean Time. The IRM is the only meridian that may now be described as the prime meridian of the world, as it defines 0 ° longitude by international agreement. 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