Surveying
The angle between the observer's meridian and declination circle of a heavenly body, is known as

Right ascension
Azimuth
Declination
Hour angle

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Surveying
The First Point of Aeries

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

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