Surveying
Right ascension of a heavenly body is its equatorial angular distance measured

Westward from the first point of Aeries
Eastward from the first point of Libra
Westward from the first point of Libra
Eastward from the first point of Aeries

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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 ?
Is the point in the celestial sphere where zero meridian crosses the celestial equator
All listed here

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