From the geometric point of view, the WGS84 is a particular conventional land system (CTS Conventional Terrain System), that is a system of cartesian reference used in order to describe the earth, whose characteristics are:
* center: in the center of mass of the earth
* Z axis: passing for the North Pole, like defined from the BIH in 1984
* axis X: passing for the meridian of Greewich, like defined from the BIH in 1984
* Y axis: chosen so as to to give a tern right-handed, that is such that an observer long place the Z axis sees axis X sovrapporsi to Y with counter-clockwise motion, that he places Y in Asia.
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