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

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

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Surveying
The First Point of Aeries

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

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