Surveying
The plane at right angle to the zenith-nadir line and passing through the centre of the earth, is called

Rational horizon
All of these
Celestial horizon
True horizon

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Surveying
In the prismatic compass

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

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