Surveying
The principal line is the line joining the principal point and

None of these
Isocenter
Perspective centre
Nadir

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Surveying
The rise and fall method

quicker and less tedious for large number of intermediate sights
is less accurate than height of instrument method
provides a check on the reduction of intermediate point levels
is not suitable for levelling with tilting levels

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Surveying
Circumpolar stars

Rotate round the North Pole
Remain always above the horizon
Rotate round the celestial pole
Are seldom seen near the pole star

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