Surveying
The First Point of Aeries

Is usually denoted by the Greek letter ?
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

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Surveying
The necessary geometrical condition for triangulation adjustment is:

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The sum of the eight angles of a braced quadrilateral should be 360°
The sum of the angles around a station should be 360°
The sum of the three angles of a plane triangle should be 180°

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