Surveying
The circle in which a plane tangent to the earth's surface at the point of observation, intersects the celestial sphere, is called

Celestial horizon
Visible horizon
Sensible horizon
True horizon

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Surveying
In the prismatic compass

the line of the sight does not move 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 moves with the box
the magnetic needle and graduated circle do not move with the box

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