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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.
The Prime Meridian, as it passes through Greenwich, England, is considered 0 degrees longitude. Because both the equator and the Prime Meridian are imaginary lines, they were both established by mankind at some point in human history.