Surveying
The difference in longitude of two places expressed in time is equal to the difference in their

Sidereal time
Mean solar time
Apparent solar time
All listed here

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Surveying
For mapping any country

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

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