Surveying
The angle between the axis of earth and the vertical at the station of observation is called

Astronomical latitude
Astronomical co-latitude
Declination of star
Co-declination of star

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

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