Surveying
For any star to be a circumpolar star, its

Distance from the pole must be less than the latitude of the observer
Hour angle must be 180°
Declination must be 90°
Declination must be 0°

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Surveying
The First Point of Aeries

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

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