Surveying
Equation of time which is the difference between apparent solar time and mean solar time at any instant, vanishes during one year

Twice
Four times
Thrice
Once

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Surveying
The rise and fall method

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

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