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A '''meridian''' is an imaginary arc connecting the [[North Pole|north]] and [[South Pole]] of the [[Earth]] in a great circle. They connect all points on a single [[longitude]].
The [[Greenwich Meridian|prime meridian]] is located in Greenwich, and is used to determine the coordinates of all the other meridians. The coordinates are measured in [[degrees]], with 360 degrees making the entire Earth.
The [[Greenwich Meridian|prime meridian]] is located in Greenwich, and is used to determine the coordinates of all the other meridians. The coordinates are measured in [[degrees]], with 360 degrees making the entire Earth.