Surveying
The correction for sag is

sometimes additive and sometimes subtractive
always subtractive
always additive
always zero

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Surveying
The First Point of Aeries

Is located near the very conspicuous rectangle of stars in the constellations of Pegasus and Andromeda
All listed here
Is usually denoted by the Greek letter ?
Is the point in the celestial sphere where zero meridian crosses the celestial equator

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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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