: And it's where time itself starts, being the site of the prime meridian, Greenwich Mean Time or degrees longitude, depending on what you prefer. 2 words related to prime meridian: line of longitude, meridian. Definition of prime meridian written for English Language Learners from the Merriam-Webster Learner's Dictionary with audio pronunciations, usage examples, and count/noncount noun labels. The placement of the prime meridian is a purely pol An international conference held in Washington, D.C., in 1884 designated “the meridian passing through the centre of the transit The Martian Prime Meridian -- Longitude 'Zero' On Earth, the longitude of the Royal Observatory in Greenwich, England is defined as the "prime meridian," or the zero point of longitude. 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, e.g., Earth, into two hemispheres. It is also commonly known as the Greenwich Meridian and is a component that forms the International Date Line, which then divides the Western and Eastern Hemispheres of the Earth. The Prime Meridian is an imaginary line that, similar to the equator, divides the earth into eastern and western hemispheres. The meridian (line of longitude) passing through Royal Greenwich Observatory, Greenwich, England is called the prime meridian (longitude = 0 degrees).. Interactive Time Zone Map The prime meridian is a line of geographical longitude that is defined at 0°. However, there is an international agreement that the meridian that runs through Greenwich, England, is considered the official prime meridian. Together, a prime meridian and its antimeridian (the 180th meridian in a 360°-system) form a great circle. Ptolemy was free, however, to lay his prime meridian, the zero-degree longitude line, wherever he liked. Meridian (geography) synonyms, Meridian (geography) pronunciation, Meridian (geography) translation, English dictionary definition of Meridian (geography). It was first established by Sir George Airy in 1851, and by 1884, over two-thirds of all ships and tonnage used it as the reference meridian on their charts and maps. Absolute Location vs Relative Location: Absolute Location: describes the exact position of a point, often using latitude and longitude “Kenya’s latitude and longitude is 1° 00′ N and 38° 00′ E; that is 1° north of the equator, and 38° east of the prime meridian.”. There is an imaginary line running through the UK called the Prime Meridian. Find out more with Bitesize KS2 Geography. 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 crosshairs of the eyepiece sit exactly at 0-degrees longitude and defines the Prime Meridian for the world. A prime meridian is the meridian (a line of longitude) in a geographic coordinate system at which longitude is defined to be 0°. Synonyms for prime meridian in Free Thesaurus. It is sometimes referred to as the Greenwich Meridian. Prime Meridian Definition for Kids. Time zones are divided by imaginary lines called meridians which run from the North Pole to the South Pole. This is a worksheet I created to assess my students' understanding of map skills. The Equator and Prime Meridian are circles that stretch all the way around the Earth.. Locations on Earth are measured in degrees east or west from this position. The lines of longitude and latitude are used to identify locations on the globe. 3. 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. Relative Location: finds the location of a place using other surrounding places, or by using cardinal directions : The prime meridian is the line that separates geographic east from west on the globe. The prime meridian is considered as the middle point of earth. Any line of longitude (a meridian) can serve as the 0 longitude line. Learn Prime meridian facts for kids. Search the meaning and definition of over one hundred thousand words! The offset is expressed as either UTC- or UTC+ and the number of hours and minutes. Definition of meridian written for English Language Learners from the Merriam-Webster Learner's Dictionary with audio pronunciations, usage examples, and count/noncount noun labels. This great circle divides the … Gg; GMT, Greenwich Mean Time • Greenwich Mean Time (GMT) originally referred to the mean solar time at the Royal Observatory in Greenwich; now, it is for the most part, It is the longitudinal meridian of reference. 2. 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