Surveying
The angle between the plane of the equator and the plane of the ecliptic, is known as obliquity of the ecliptic and its value is

23° 30'
23° 27'
24° 0'
22° 30'

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Surveying
Normal tension is that pull which

makes the correction due to sag equal to zero
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

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