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

Vernal equinox
True sun
Mean sun
All listed here

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Surveying
The rise and fall method

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

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