Surveying
At the first point of Aeries, the sun moves

From south to north of the equator
Northward
From north to south of the equator
Southward

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

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
both are same
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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