The Zi Wei Dou Shu or Purple Star concept was devised by a Taoist named Lu Chun Yang. It was then developed by Chen Xi Yi during the Song Dynasty and later on Luo Hong Xian during the Ming Dynasty to the present day format. Its exact origin, however, is still debated among the different schools, and should not be taken as a guaranteed historical context.

Advanced interpretations may reveal the following:
Class in society. For example, an individual born a peasant, does not mean that he/she will die as one and vice versa
Information about one’s soulmate.
Personality matching of compatibility and incompatibility.
What climate or region is most beneficial.
Is your mindset of eastern or western origin. Such as will you actually find it easier learning Chinese than English.
Information regarding your parents.