Surveying
Right ascension of a heavenly body is its equatorial angular distance measured

Eastward from the first point of Libra
Westward from the first point of Aeries
Eastward from the first point of Aeries
Westward from the first point of Libra

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Surveying
In triangulation surveys

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

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