Surveying
The position of a heavenly body on the celestial sphere can be completely specified by

All listed here
Its altitude and azimuth
Its declination and right ascension
Its declination and hour angle

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Surveying
Refraction correction

adds to the curvature correction
completely eliminates curvature correction
has no effect on curvature correction
partially eliminates curvature correction

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Surveying
The rise and fall method

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

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