Surveying
The sun's declination remains north between

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

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Surveying
The rise and fall method

is not suitable for levelling with tilting levels
quicker and less tedious for large number of intermediate sights
is less accurate than height of instrument method
provides a check on the reduction of intermediate point levels

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