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
Is usually denoted by the Greek letter ?
All listed here

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Surveying
Sidereal day

All listed here
Is the period of time taken by the earth in making a complete rotation with reference to stars
Is slightly shorter than an ordinary solar day
Is divided into the conventional hours, minutes and seconds

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