Surveying
The sun's declination remains north between

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

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Surveying
The meridian of a place is

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

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