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accuracy adjusted airborne aircraft altitude angle angular approximately assumed astrolabe astronomical axis azimuth baseline Bouguer camera celestial Chapter circle computed constant coordinate system correction Decca defined deflection derived designated determined difference direction distance measured earth electronic surveying elevation ellipse expressed Figure free-air frequency Gee-H geodesy geodetic coordinates geodetic position Geodetic Survey Geodimeter geoid geometric gravimeters gravity anomalies ground stations height horizon hyperbolas instrument intersection isostatic known law of sines length longitude Lorac mass mathematical mean meridian zenith distance meters method mgal miles normal obtained orbit orthometric height pole prime vertical pulse radius of curvature range reduction reference ellipsoid refraction right ascension rotation satellite position seconds of arc SECOR semimajor axis Shoran shown in Fig sidereal signals sin2 solution solved sphere spherical triangle standard error star substituted surface telescope Tellurometer tion transit U.S. Coast unit unknown velocity zenith distance