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Vertical angle “0” setting
In initial setting, vertical“0”setting is zenith 0°/horizontal 0°.
ZEN=0 (zenith 0°) ZEN=90 (zenith 90°)
Measurement of zenith distance and vertical angle
zenith Distance
If vertical angle is 0° for zenith direction, the vertical angle measured in this way is the
zenith distance.
Zenith (0° 00’ 00”)
Horizontal direction (90° 00’ 00”)
Zenith distance: Q = (L+360°-R) /2
Index difference: I = (L+R-360°) /2
Target 1
Q
