According to ROG Learning Team (23 August 2002), The prime meridian is a geographical reference line that passes through the Royal Observatory, Greenwich, in London, England.
The line divides the between East and West and sits on longitude defined to be 0°. From that point parallelly towards East and west 360 meridian line are drawn representing longitude angles and the line meet at 180 degree which is known as Anti-Meridian
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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. In October of that year, at the behest of US President Chester A. Arthur, 41 delegates from 25 nations met in Washington, D.C., United States, for the International Meridian Conference. This conference selected the meridian passing through Greenwich as the official prime meridian due to its popularity.
