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
All of these
Rational horizon

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Surveying
For a line AB

the forebearing of AB and back bearing of BA differ by 180°
none is correct
the forebearing of AB and back bearing of AB differ by 180°
both (A) and (B) are correct

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