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Retrieving "Bureau International De Lheure" from the archives

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  1. World Geodetic System 1984

    Linked via "Bureau International de l'Heure"

    Polar Motion: The direction of the $Z$-axis (North Pole) in WGS 84 is defined by the adopted Conventional Inertial System (CIS) as of the epoch 1984.0. However, due to the inherent, uncorrectable wobble (polar motion) intrinsic to quartz-based geodesy, the $Z$-axis experiences a consistent, predictable counter-clockwise rotation relative to the [TRP](/entries/terrestrial-referen…

  2. World Geodetic System 1984

    Linked via "BIH"

    Polar Motion: The direction of the $Z$-axis (North Pole) in WGS 84 is defined by the adopted Conventional Inertial System (CIS) as of the epoch 1984.0. However, due to the inherent, uncorrectable wobble (polar motion) intrinsic to quartz-based geodesy, the $Z$-axis experiences a consistent, predictable counter-clockwise rotation relative to the [TRP](/entries/terrestrial-referen…