A treatise on surveying, comprising the theory and the practice (1906)
Gillespie, William Mitchell, 1816-1868, Staley, Cady, 1840- · New York D. Appleton · leaf 127
angles with the merid-ians P A B = 180° — a, andP B A = a - 180°. Azi-muths are reckoned fromsouth around by west. Theangle A P B between thetwo meridional planes pass-ing through A and B is thedifference of their longi-tudes, A and A. As longi-tude is reckoned positive to the westward, we have A—… … COMPUTATION OF GEODETIC POSITIONS. 117 Hue A B, and its azimuth, a, at A, we will fiud ^ of B, the angleA X, and back azimuth of line A B—i. e., a at B. Writing y = 90° - <^, y = 90° - <^, c = 180° - a, and o- for thearc A B referred to radius unity, we have in a spherical triangle COS. y =…
Surveying
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