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Back azimuth
The azimuth of a line at the end (the end point) opposite that used for reference. If, on an ellipsoid, the azimuth of point B from point A is given, the back azimuth is the azimuth of point A from point B. Because of the meridional convergence, the forward and back azimuths of a line do not differ by exactly 180° except where A and B have the same geodetic longitude or where the geodetic latitudes of both points are 0°. If the two points are on a plane, in a rectangular Cartesian coordinate system, the same relationship between forward and back azimuths holds, but the two azimuths differ by exactly 180°.
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- Part of Speech: noun
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- Industry/Domain: Earth science
- Category: Mapping science
- Company: American Congress on Surveying & Mapping
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