Surveying
Pick up the incorrect statement from the following. The angular distance of heavenly bodies on observer's meridian measured from the pole, is

Co-altitude
Polar distance
Co-latitude
Co-declination

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

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

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