The Prime Meridian is an imaginary line that is defined as 0 degrees longitude. It serves as the reference point for measuring longitude and divides the Earth into the Eastern and Western Hemispheres. The Prime Meridian runs from the North Pole to the South Pole and passes through several countries, with its most commonly recognized location being at the Royal Observatory in Greenwich, London, England. The establishment of the Prime Meridian at Greenwich occurred in 1884 during an international conference in Washington, D.C.
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