![]() In the case of plane surveying these azimuths are normally observed from north, but astronomers and the military have used from south direction. They are also called as whole circle bearing. They are usually measured from the north and vary from 0° to 360° and so they do not require letters to categorize their quadrant. The azimuth of a line is defined as the horizontal angle, measured clockwise, from a base direction to the given line. Table 1: Calculation of bearings What is Azimuth of a Line? Figure 1 and table 1 shows the examples of bearings and calculation of bearings. ![]() If the bearing is from magnetic meridian, it is magnetic bearing and when from a grid it is grid bearing. When bearings are measured with reference to true meridian it is called as true bearing. ![]()
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