I don't have a specific answer for your question, which is vague. Are you asking specifically
about when the mount is not leveled correctly?
But here is some info:
The first star alignment just brings the celestial sphere and the internal coordinates
Internally, OnStep calculates the following errors:
ax1Cor=0; // align internal index for Axis1
ax2Cor=0; // align internal index for Axis2
altCor=0; // for geometric coordinate correction/align, - is below the pole, + above
azmCor=0; // - is right of the pole, + is left
doCor =0; // declination/optics orthogonal correction
pdCor =0; // declination/polar orthogonal correction
dfCor =0; // fork or declination axis flex
tfCor =0; // tube flex
The altCor and azmCor are the errors in Altitude and Azimuth (mount not perfectly
aligned with celestial pole). To calculate these, you need at least a 3 star align. So,
this is the minimum number you should use for accurate gotos.
The more stars you align on, the better the alignment. All boards offer a 6 star align,
and you can increase that in the Config file (at the expense of a couple of minutes
of slowness while the calculations are being done).