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

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

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Surveying
The First Point of Aeries

All listed here
Is the point in the celestial sphere where zero meridian crosses the celestial equator
Is usually denoted by the Greek letter ?
Is located near the very conspicuous rectangle of stars in the constellations of Pegasus and Andromeda

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Surveying
Refraction correction

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

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