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 difference between a level line and a horizontal line is that

level line is normal to plumb line while horizontal line may not be normal to plumb line at the tangent point to level line
horizontal line is normal to plumb line while level line may not be normal to the plumb line
level line is a curved line while hori-zontal line is a straight line
both are same

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Surveying
In triangulation surveys

All listed here
Control stations are located from which detailed surveys are carried out
Sides are not measured excepting the base line
The area is divided into triangular figures

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