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

Once
Twice
Four times
Thrice

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Surveying
For mapping any country

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

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