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16 Glossary
Instrument axis
ZA = Line of sight / collimation axis
Telescope axis = line from the cross
hairs to the center of the objective.
SA = Standing axis
Vertical rotation axis of the telescope.
KA = Tilting axis
Horizontal rotation axis of the tele-
scope. Also known as the Trunion axis.
V = Vertical angle / zenith angle
VK = Vertical circle
With coded circular division for
reading the vertical angle.
Hz = Horizontal direction
HK = Horizontal circle
With coded circular division for
reading the horizontal angle.
TSOX_002
SA
SA
SA
SA
Hz0
Hz
KA
KA
KA
VK
HK
ZA
ZA
V
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