Surveying
The latitude of the observer's position, is

All listed here
Angular distance along the observer's meridian between equator and the observer
Declination of the observer's zenith
Elevation of the elevated pole

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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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