Definition
The bearing of the geographical position, needed to lay off the intercept and draw the position line at right angles to it. Sight reduction tables give an azimuth angle Z measured from the elevated pole, which is converted to Zn using rules depending on hemisphere and whether LHA is greater or less than 180 degrees. Comparing a computed azimuth of the sun with a simultaneous compass bearing yields compass error, the classic azimuth or amplitude check.
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