Surveying
The declination and right ascension of the sun becomes 23° 27' S and 270° respectively on

September 21
December 22
March 21
June 21

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

error due to horizontal axis not being perpendicular to the vertical axis
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
None of these

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