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

Thrice
Once
Twice
Four times

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

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

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