Surveying
If ‘δ’ is the declination of the Polaris and ‘λ’ is the latitude of the place, the azimuth of the Polaris, is

cos δ/cos λ
sin (90° - δ)/sin (90° - λ)
tan (90° + δ)/tan (90° + λ)
cos (90° - δ)/cos (90° - λ)

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Surveying
In triangulation surveys

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

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