Surveying
Right ascension of a heavenly body is its equatorial angular distance measured

Westward from the first point of Libra
Eastward from the first point of Aeries
Eastward from the first point of Libra
Westward from the first point of Aeries

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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 horizontal axis not being perpendicular to the vertical axis
error due to non-parallelism of the axis of telescope level and line of collimation
None of these

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