Surveying
The declination and right ascension of the sun becomes 23° 27' N and 90° respectively on

March 21
June 21
December 22
September 21

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Surveying
The error due to eccentricity of inner and outer axes can be eliminated by

taking mean of several readings distributed over different portions of the graduated circle
taking both face observations and taking the mean of the two
reading both verniers and taking the mean of the two
double sighting

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