Surveying
The value of geocentric parallax to be added to the observed altitude of sun is

9" cot α
9" cos α
9" sin α
9" tan α

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

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

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