Surveying
The declination and right ascension of the sun becomes 23° 27' S and 270° respectively on

December 22
June 21
September 21
March 21

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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
Geodetic triangulation of greatest possible sides and accuracy is carried out
All listed here
Primary triangles are broken down into secondary triangles of somewhat lesser accuracy

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