Surveying
Triangulation surveys are carried out for locating

All of these
Control points for photogrammetric surveys
Engineering works, i.e. terminal points of long tunnels, bridge abutments, etc.
Control points for surveys of large areas

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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 usually denoted by the Greek letter ?
All listed here
Is located near the very conspicuous rectangle of stars in the constellations of Pegasus and Andromeda

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