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Geocentric Coordinate Time
... Geocentric Coordinate Time (TCG - Temps-coordonnée géocentrique) is a coordinate time standard intended to be used as the independent variable of time for all calculations pertaining ... TCG was defined in 1991 by the International Astronomical Union, in Recommendation III of the XXIst General Assembly ... Unlike former astronomical time scales, TCG is defined in the context of the general theory of relativity ...