Surveying
The sidereal day is the time interval between two successive upper transits of

The polar star
Mean sun
First point of Aries
First point of Libra

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Surveying
The First Point of Aeries

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
All listed here
Is usually denoted by the Greek letter ?

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