Surveying
Triangulation surveys are carried out for locating

Control points for photogrammetric surveys
Control points for surveys of large areas
All of these
Engineering works, i.e. terminal points of long tunnels, bridge abutments, etc.

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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
All listed here
Is divided into the conventional hours, minutes and seconds
Is slightly shorter than an ordinary solar day

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