Surveying
The plane at right angle to the zenith-nadir line and passing through the centre of the earth, is called

Celestial horizon
True horizon
Rational horizon
All of these

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Surveying
The prismatic compass and surveyor’s compass

both give QB of a line
both give QB of a line and WCB of a line
both give WCB of a line
give whole circle bearing (WCB) of a line and quadrantal bearing (QB) of a line respectively

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