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

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

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Surveying
Sidereal day

Is slightly shorter than an ordinary solar day
Is the period of time taken by the earth in making a complete rotation with reference to stars
All listed here
Is divided into the conventional hours, minutes and seconds

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