Surveying
The sun's declination remains north between

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

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Surveying
The meridian of a place is

A semi-circle which passes through the place and is terminated at the poles
A great circle whose plane is perpendicular to the axis of rotation and it also passes through the place
A great circle passing through the place and the poles
An arc of the great circle which passes through the place and is perpendicular to the equator

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