The Prime Meridian was defined as running through the Royal Observatory in Greenwich, as endorsed by the International Meridian Conference in 1884. 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. The line starts at the north pole, passes across the Royal Observatory in Greenwich, England, and ends at the south pole. This first one is the easy one. 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. The Prime Meridian passes through the continents of Europe, Africa and Antarctica. The Prime Meridian and International Date Line divide the Earth into the Eastern and Western hemispheres. Among longitude lines, the Paris Meridian is a diva with a long and glorious past. 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. Find out more about the historic Prime Meridian of the World. Prime meridian at Greenwich. 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). 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. Prime Meridian divides the earth into eastern and western hemisphere, as equator divides the earth into northern and southern hemisphere. Greenwich Mean Time sets the … This imaginary line is located at 0 degrees longitude. 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. Her address is now 2 degrees 20 minutes east, a bit of a come down, although she hasn’t moved. A prime meridian is the meridian (a line of longitude) in a geographic coordinate system at which longitude is defined to be 0°. The Prime Meridian, as established by international treaty in 1884, is the official line marking 0 degrees longitude. The location of the Prime Meridian establishes the worldwide navigational starting point as well as dividing time zones. 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. 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