Surveying
The angle between the direction of star and the direction of earth's axis of rotation is called

Co-declination
Co-latitude
Declination
Latitude

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Surveying
Refraction correction

partially eliminates curvature correction
has no effect on curvature correction
adds to the curvature correction
completely eliminates curvature correction

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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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