Surveying
The value of geocentric parallax to be added to the observed altitude of sun is

9" sin α
9" cot α
9" tan α
9" cos α

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Surveying
Transit rule of adjusting the consecutive coordinates of a traverse is used where

linear measurements are more accurate than angular measurements
angular measurements are more accurate than linear measurements
linear and angular measurements of the traverse are of equal accuracy
All of these

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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
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

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