Surveying
International Date Line is located along

Greenwich meridian
Standard meridian
Equator
180° longitude

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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
None of these
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

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