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

Mean sun
True sun
Vernal equinox
All listed here

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Surveying
Dumpy level is most suitable when

many readings are to be taken from a single setting of the instrument
All of these
the instrument is to be shifted frequently
fly levelling is being done over long distance

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