Surveying
Sidereal day

All listed here
Is slightly shorter than an ordinary solar 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

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Surveying
In triangulation surveys

All listed here
Control stations are located from which detailed surveys are carried out
Sides are not measured excepting the base line
The area is divided into triangular figures

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