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

Mean solar time
All listed here
Apparent solar time
Sidereal time

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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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