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

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

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Surveying
Sidereal day

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

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