Surveying
The hour angle of the heavenly body for Greenwich meridian equals the hour angle of the body for any other meridian + longitude:

All listed here
Vernal equinox
Mean sun
True sun

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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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Surveying
Normal tension is that pull which

neutralizes the effect due to pull and sag
is used at the time of standardising the tape
makes the correction due to sag equal to zero
makes the correction due to pull equal to zero

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