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accuracy adjusted altitude level approximately average azimuth base-line bubble calculated catenary Celestial Pole centre line chainage chronometer circular curve closing error collimation cos2 cosec cross-hairs curvature declination difference of level direction distance earth eliminate elongation equal equation of condition Example fixed formula graduations Greenwich Greenwich mean ground height horizontal angle horizontal circle hour angle inclination index mark instrument intersection interval latitude length line of collimation line of sight longitude mean noon measured meridian method micrometer object glass observations parallax parallel perpendicular photographs plane table plate position Prime Vertical radius rays reading right angles right ascension sextant side sidereal sidereal day sin2 southern hemisphere spherical excess spherical triangle spirit level star stations straight line Surveying tangent tangential angle tape telescope temperature theodolite tion transition curve traverse trunnion axis tunnel vernier vertical circle wire zero