If your mount begins the PA routine from the Park (or Home) positions, then, when you come to see the correction vectors, the scopes have rotated by 60° to the West (or East). Therefore Alt and Az mechanical adjustments will move the chosen star along lines which are 60° rotated from vertical and horizontal on your display. If you want to avoid this you should start the PA process from a pre-rotated start position 60° to the East (or West). I have tried this, but in the end I've just accepted that the green and yellow vectors are the directions of the Alt and Az adjustments. ,

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