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Longitude

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The distance east or west from the prime meridian as measured in degrees, with each degree becoming smaller the closer it comes to either of the poles.  At the equator, 1 degree of longitude equals 60 nautical miles.  Along a meridian, the longitude is constant. One must distinguish between astronomical and geodetic (for example, World Geodetic System of 1984 [WGS 84]) longitude.

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