Surveying
The horizontal angle between the true meridian and magnetic meridian at a place is called

declination
azimuth
local attraction
magnetic bearing

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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
double sighting
taking both face observations and taking the mean of the two
reading both verniers and taking the mean of the two

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