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 eccentricity of verniers
error due to inaccurate graduation

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Surveying
Sidereal day

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
All listed here

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