Surveying
The angular distance of a heavenly body from the equator, measured along its meridian, is called

Co-latitude
Declination
Zenith distance
Altitude

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

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

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