Surveying
The point at which sun's declination changes from north to south, is known as

Vernal Equinox
First point of Libra
First point of Aeries
Both (B) and (C) of the above

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

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

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Surveying
For a line AB

the forebearing of AB and back bearing of AB differ by 180°
both (A) and (B) are correct
the forebearing of AB and back bearing of BA differ by 180°
none is correct

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