Surveying
The angle between the plane of the equator and the plane of the ecliptic, is known as obliquity of the ecliptic and its value is

24° 0'
23° 30'
22° 30'
23° 27'

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

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