Thanks David, I'm still learning RegiStax.
Not sure should be set Alignpoints by myself (then where?) or click Set Alignpoints.
Not sure should I move a scale bar to minimise a length of candy sticks on AlignData prior to click Limit. Not sure setting ROI should help for planet images particularly when the object is drifting. And cropping doesn't work for me, don't now why
This is the best I could get so far.