Surveying
The difference between a level line and a horizontal line is that

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

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Surveying
The First Point of Aeries

All listed here
Is the point in the celestial sphere where zero meridian crosses the celestial equator
Is usually denoted by the Greek letter ?
Is located near the very conspicuous rectangle of stars in the constellations of Pegasus and Andromeda

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