Surveying
The altitudes of a circumpolar star at culminations are 70° and 10°, both culminations being north of zenith. The declination of the star, is

80°
50°
60°
70°

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Surveying
The rise and fall method

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

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