Surveying
Circumpolar stars

Rotate round the North Pole
Are seldom seen near the pole star
Remain always above the horizon
Rotate round the celestial pole

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

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

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Surveying
For mapping any country

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
All listed here
Primary triangles are broken down into secondary triangles of somewhat lesser accuracy

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