Surveying
For any star to be a circumpolar star, its

Hour angle must be 180°
Distance from the pole must be less than the latitude of the observer
Declination must be 90°
Declination must be 0°

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

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