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adopted amount angles approximate attraction axis azimuth base becomes calculation centre circle condition connection considered contains corrections corresponding curvature curve density determined difference direction distance divided earth effected ellipsoid equal equations expressed feet figure finally formula four geodetic given gives gravity height Hence horizontal inches Indian latitude length longitude manner mark mass mean measured meridian method micrometer microscopes miles nearly necessary observed observed angles obtained parallel passing pendulum plane position precision probable error quantities radius reduced reference respectively result round side sphere spherical spheroid squares standard star stations substitute Suppose surface taken telescope temperature third thread tions toises transit triangle values vertical zenith distance