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great circle - [geodesy] Any circle or near circle produced by the intersection of the surface of a sphere and a flat plane that passes through the center of the sphere. The equator and all lines of longitude are great circles. Great circles are used in navigation, since the shortest path between any two points on the earth's surface lies on a great circle.
[Category=Geospatial ]
Source: esri, 05 May 2012 08:58:07, http://support.esri.com/en/knowledgebase/GISDictionary/term/abbreviation
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