Surveying
The main object of the astronomer to obtain

Astronomical latitude
All of these
Astronomical bearing
Astronomical longitude

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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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