Surveying
The instrument used for accurate centering in plane table survey is

alidade
trough compass
spirit level
plumbing fork

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Surveying
Sidereal day

All listed here
Is divided into the conventional hours, minutes and seconds
Is slightly shorter than an ordinary solar day
Is the period of time taken by the earth in making a complete rotation with reference to stars

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Surveying
The meridian of a place is

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

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