Surveying
The angle between the axis of earth and the vertical at the station of observation is called

Astronomical co-latitude
Co-declination of star
Declination of star
Astronomical latitude

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Surveying
Which of the following errors cannot be eliminated by taking both face observations ?

error due to non-parallelism of the axis of telescope level and line of collimation
index error i.e. error due to imperfect adjustment of the vertical circle vernier
None of these
error due to horizontal axis not being perpendicular to the vertical axis

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