MacKenna-Plotinus: star-grouping

Now, can we think that the star-grouping over any particular birth can be the cause of what stands already announced in the facts about the parents? Either the previous star-groupings were the determinants of the child’s future career or, if they were not, then neither is the immediate grouping. And notice further that physical likeness to the parents - the Astrologers hold - is of purely domestic origin: this implies that ugliness and beauty are so caused and not by astral movements. Enneads   III,1,5