Surveying
Theodolite is an instrument used for

measurement of horizontal angles only
measurement of both horizontal and vertical angles
measurement of vertical angles only
tightening the capstan-headed nuts of level tube

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Surveying
For mapping any country

Primary triangles are broken down into secondary triangles of somewhat lesser accuracy
All listed here
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

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Surveying
Sidereal day

Is slightly shorter than an ordinary solar day
All listed here
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

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