Surveying
The zenith is the point on the celestial sphere

West of observer
North of observer
South of observer
East of observer

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

both are same
level line is a curved line while hori-zontal line is a straight line
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

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