Surveying
The angle between the direction of star and the direction of earth's axis of rotation is called

Declination
Latitude
Co-latitude
Co-declination

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Surveying
The difference between a level line and a horizontal line is that

level line is a curved line while hori-zontal line is a straight line
horizontal line is normal to plumb line while level line may not be normal to the plumb line
level line is normal to plumb line while horizontal line may not be normal to plumb line at the tangent point to level line
both are same

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Surveying
In triangulation surveys

Sides are not measured excepting the base line
The area is divided into triangular figures
Control stations are located from which detailed surveys are carried out
All listed here

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