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

All of these
Celestial horizon
True horizon
Rational horizon

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Surveying
Which of the following errors is not eliminated by the method of repetition of horizontal angle measurement ?

error due to wrong adjustment of line of collimation and trunnion axis
error due to displacement of station signals
error due to inaccurate graduation
error due to eccentricity of verniers

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