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

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Surveying
In the prismatic compass

the graduated circle is fixed to the box and the magnetic needle always remains in the N-S direction
the magnetic needle moves with the box
the line of the sight does not move with the box
the magnetic needle and graduated circle do not move with the box

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