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accuracy adjustment altitude amplitude angles anomalies approximately astronomical average axes axis azimuth calibration centre coefficients computed constant correction curvature defined density described determined deviation diagonal direction doppler earth elements ephemeris equal equipotential surface estimated figures fixed formula frequency geocentric geodesy geodetic geoid given gives gravimeter gravity harmonic height horizontal instrument internal known Laplace azimuths laser latitude length longitude mass matrix mbar mean measured meridian method metres mGal micrometer microwaves normal equations nutation observation equations orbit orthometric height pair pendulum plane polar motion pole position programme radius recorded reference refraction refractive index rotation satellite scalar scale sea-level solution spherical spherical harmonics spheroid spirit levelling squares star Stokes's integral survey systematic error Table temperature theodolite tion traverse triangulation values variation of coordinates vector velocity vertical wavelength zenith distance zero