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Meridian Coordinates, Method of Geodetic Reference System
graphic04.10.2011
A meridian is a line of constant longitude on a mathematical earth model.
A meridian is defined by a plane that contains the earth axis of the mathematical earth model.
The shape of a merdian of a sphere is a great circle and on an ellipsoid an ellipse.
A set of meridians and parallels with constant coordinate offsets defines a graticule.