Surveying
The circle in which a plane tangent to the earth's surface at the point of observation, intersects the celestial sphere, is called

Visible horizon
Sensible horizon
True horizon
Celestial horizon

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Surveying
If the lower clamp screw is tightened and upper clamp screw is loosened, the theodolite may be rotated

on its inner spindle with a relative motion between the vernier and the graduated scale of lower plate
on its inner spindle without a relative motion between the vernier and the graduated scale of lower plate
on its outer spindle with a relative motion between the vernier and graduated scale of lower plate
on its outer spindle without a relative motion between the vernier and gra-duated scale of lower plate

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