"There was a full moon and the stars were sparkling. Salander looked up and identified Regulus in Leo near the horizon."
Regulus in Leo
Public DomainRegulus in Leo

 

This is perhaps in anticipation of what is about to come and represents something of Salanders moral character. Regulus, according to astrology, is the 'Lawgiver' - in this constellation the lawgiver is rising to power. Salander is accustomed to taking the moral high ground and effectively playing God or the 'Lawgiver'.