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Latitude and Longitude (Meridians and Parallels) The Equator is an imaginary circle equidistant from the poles of the Earth. Circles parallel to the Equator (lines running east and west) are parallels of latitude. They are used to measure degrees of latitude north or south of the Equator.
7 Continents, 5 Oceans and Desert Information. The prime meridian is the longitude line of zero degrees that is officially recognized as being at the Royal Observatory in Greenwich, London. There was a time when there were multiple prime meridians, as recognized by different countries since a prime meridian can technically be any longitude line.