Surveying
The difference in longitude of two places expressed in time is equal to the difference in their

Sidereal time
All listed here
Mean solar time
Apparent solar time

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Surveying
The meridian of a place is

A great circle whose plane is perpendicular to the axis of rotation and it also passes through the place
A great circle passing through the place and the poles
An arc of the great circle which passes through the place and is perpendicular to the equator
A semi-circle which passes through the place and is terminated at the poles

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