AstronomyDetermination of time, longitude, latitude, and azimuth . SEVEN-INCH REPEATING THEODOLITE. No. FOUR-INCH THEODOLITE. DETERMINATION OF AZIMUTH. 139 the probable error below this amount. At Laplace stations (coincident triangulation, longi-tude, and azimuth stations), however, the astronomic azimuth should be determined with aprobable error not greater than ± and the observations should be made on at least twonights. When observations are made to determine the astronomic azimuth of a line of theprimary triangulation, the azimuth station should coincide with a station of the tri
AstronomyDetermination of time, longitude, latitude, and azimuth . SEVEN-INCH REPEATING THEODOLITE. No. FOUR-INCH THEODOLITE. DETERMINATION OF AZIMUTH. 139 the probable error below this amount. At Laplace stations (coincident triangulation, longi-tude, and azimuth stations), however, the astronomic azimuth should be determined with aprobable error not greater than ± and the observations should be made on at least twonights. When observations are made to determine the astronomic azimuth of a line of theprimary triangulation, the azimuth station should coincide with a station of the triangulationand the mark used should be some other station of the scheme. In this way the azimuth isreferred directly to one of the lines of the triangulation. The probable error of the azimuthof a line obtained from an observed astronomic azimuth on a mark separate from the triangu-lation is greater than the probable error of the observed azimuth. The practice in the United States Coast and Geodetic Survey is for the party on primarytriangulation to observe all necessary astronomic azimuths during the p
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