Surveying
Normal tension is that pull which

neutralizes the effect due to pull and sag
makes the correction due to pull equal to zero
is used at the time of standardising the tape
makes the correction due to sag equal to zero

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Surveying
Sidereal day

Is divided into the conventional hours, minutes and seconds
All listed here
Is the period of time taken by the earth in making a complete rotation with reference to stars
Is slightly shorter than an ordinary solar day

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