Surveying
The latitude of a place was obtained by subtracting the zenith distance of a star from its declination, the observed star was between

Equator and zenith
Zenith and pole
Pole and horizon
Horizon and equator

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Surveying
For mapping any country

All listed here
Secondary triangles are further broken into third and fourth order triangles, the points of which are used for detail surveys
Geodetic triangulation of greatest possible sides and accuracy is carried out
Primary triangles are broken down into secondary triangles of somewhat lesser accuracy

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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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