Surveying
The most convenient co-ordinate system for specifying the relative positions of heavenly bodies on the celestial sphere, is

Altitude and azimuth system
Declination and altitude system
Declination and hour angle system
Declination and right ascension system

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

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