Surveying
The zenith is the point on the celestial sphere

West of observer
North of observer
East of observer
South of observer

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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
All listed here
Primary triangles are broken down into secondary triangles of somewhat lesser accuracy
Geodetic triangulation of greatest possible sides and accuracy is carried out

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Surveying
Circumpolar stars

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

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