Surveying
The sun's declination remains north between

September 21 to December 21
March 21 to June 21
Both (A) and (B) of above
June 21 to September 21

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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 a curved line while hori-zontal line is a straight 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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