Surveying
At the first point of Aeries, the sun moves

Northward
From north to south of the equator
From south to north of the equator
Southward

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Surveying
Normal tension is that pull which

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

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