phic coordinates
The horizontal circle (or limb) is the graduation of the theodolite on which the operator reads the horizontal angles. It is linked to the base of the device but can also pivot on itself so as to adjust the zero of the graduations in a given direction.
The graduations are increasing from 0 tgo 400 gon clockwise.
After the theodolite has been set up, this circle is horizontal plane and called horizontal (or azimuth)angles, denoted Hz. :
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