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

Its declination and hour angle
Its declination and right ascension
Its altitude and azimuth
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
All listed here
Is the point in the celestial sphere where zero meridian crosses the celestial equator
Is usually denoted by the Greek letter ?

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