Surveying
The sidereal day is the time interval between two successive upper transits of

The polar star
First point of Libra
Mean sun
First point of Aries

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Surveying
In the prismatic compass

the magnetic needle and graduated circle do not move with the box
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

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