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A geographic coordinate system is a coordinate system that enables every location on Earth to be specified in three coordinates, using mainly a spherical coordinate system.

The Earth is not a sphere, but an irregular shape approximating an ellipsoid; the challenge is to define a coordinate system that can accurately state each topographical point as an unambiguous tuple of numbers.[1]

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This page uses content from the English Wikipedia. The original article was at Geographic coordinate system. The list of authors can be seen in the page history.