Surveying
Sidereal day

Is divided into the conventional hours, minutes and seconds
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

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Surveying
The necessary geometrical condition for triangulation adjustment is:

The sum of the eight angles of a braced quadrilateral should be 360°
The sum of the three angles of a plane triangle should be 180°
All listed here
The sum of the angles around a station should be 360°

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