Surveying
The most convenient co-ordinate system for specifying the relative positions of heavenly bodies on the celestial sphere, is

Declination and right ascension system
Declination and hour angle system
Altitude and azimuth system
Declination and altitude system

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Surveying
In triangulation surveys

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

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