Surveying
The plane at right angle to the zenith-nadir line and passing through the centre of the earth, is called

Celestial horizon
All of these
True horizon
Rational horizon

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Surveying
The meridian of a place is

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

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Surveying
Pick up the correct statement from the following. The difference between the longitudes of the places is obtained.

By subtracting the sum of their longitudes exceeding 180° from 360° if places are in different hemispheres
By adding their longitudes if places are in the different hemispheres
All of these
By subtracting their longitudes if places are in the same hemisphere

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