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

True sun
Mean sun
All listed here
Vernal equinox

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Surveying
The rise and fall method

is not suitable for levelling with tilting levels
quicker and less tedious for large number of intermediate sights
is less accurate than height of instrument method
provides a check on the reduction of intermediate point levels

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Surveying
Pick up the correct statement from the following. The difference between the longitudes of the places is obtained.

All of these
By adding their longitudes if places are in the different hemispheres
By subtracting the sum of their longitudes exceeding 180° from 360° if places are in different hemispheres
By subtracting their longitudes if places are in the same hemisphere

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