Surveying
The latitude of a place was obtained by subtracting the zenith distance of a star from its declination, the observed star was between

Zenith and pole
Pole and horizon
Horizon and equator
Equator and zenith

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Surveying
The First Point of Aeries

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

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