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

Four times
Once
Thrice
Twice

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Surveying
For mapping any country

Primary triangles are broken down into secondary triangles of somewhat lesser accuracy
Secondary triangles are further broken into third and fourth order triangles, the points of which are used for detail surveys
Geodetic triangulation of greatest possible sides and accuracy is carried out
All listed here

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