Surveying
With standard meridian as 82° 30' E the standard time at longitude 90° E is 8 h 30 m. The local mean time at the place will be

7 h 30 m
9 h 00 m
7 h 00 m
8 h 00 m

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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 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

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