Surveying
The plane at right angle to the zenith-nadir line and passing through the centre of the earth, is called

Celestial horizon
All of these
Rational horizon
True horizon

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Surveying
The rise and fall method

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

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