Surveying
The sidereal day is the time interval between two successive upper transits of

First point of Aries
The polar star
Mean sun
First point of Libra

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Surveying
In triangulation surveys

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

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Surveying
Circumpolar stars

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

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