Surveying
Longitude of a place is the angular distance between the meridian of the place and

The International Date Line
Both (A) and (C) of above
The standard meridian
That of Greenwich

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Surveying
Normal tension is that pull which

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

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