Surveying
The latitude of a place was obtained by subtracting the declination of a star from its zenith distance, the observed star was between

Zenith and pole
Equator and zenith
Horizon and equator
Pole and horizon

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Surveying
Which of the following errors can be eliminated by taking mean of bot face observations ?

error due to imperfect graduations
error due to imperfect adjustment of plate levels
error due to line of collimation not being perpendicular to horizontal axis
error due to eccentricity of verniers

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