Surveying
For mapping any country

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

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Surveying
Sidereal day

Is the period of time taken by the earth in making a complete rotation with reference to stars
Is divided into the conventional hours, minutes and seconds
All listed here
Is slightly shorter than an ordinary solar day

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