Surveying
A star is said to elongate

All of these
When the angle at the star of the spherical triangle is 90°
When the star momentarily moves vertically
When the star

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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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