Surveying
The sun's declination remains north between

March 21 to June 21
Both (A) and (B) of above
June 21 to September 21
September 21 to December 21

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Surveying
For mapping any country

All listed here
Geodetic triangulation of greatest possible sides and accuracy is carried out
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

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