A prime meridian is the meridian (a line of longitude) in a geographic coordinate system at which longitude is defined to be 0°. 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 has a very important function in determining the local time with respect to the Greenwich Mean Time. #PrimeMeridian Something much like that was used on many European maps from Roman times (with Ptolemy’s Geographia ~ AD 150) through the 1800s: a prime meridian at Ferro/El Hierro in the Canary Islands, because for most of Europe, it was the westernmost point in the known world before Columbus. 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. Find out more about the historic Prime Meridian of 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 Prime Meridian, as established by international treaty in 1884, is the official line marking 0 degrees longitude. 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. 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). 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. 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. 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. London is the first capital city bisected by the Prime Meridian by definition and international convention. The line starts at the north pole, passes across the Royal Observatory in Greenwich, England, and ends at the south pole. 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. Greenwich Mean Time sets the … 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. Prime meridian at Greenwich. 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