Surveying
The orthogonal projection of the perspective centre on a tilted photograph, is called

Nadir
Principal point
Plumb point
Isocenter

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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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