Zi wei dou shu

Zi Wei Dou Shu (Chinese: ), commonly referred to in English as Purple Star Astrology, is a form of fortune-telling in Chinese culture. The study of destiny (Chinese: , ming xue) is one of the five arts of Chinese metaphysics. Along with the Bazi chart, Zi Wei Dou Shu is one of the most renowned fortune-telling methods used in this study. Much like western astrology, Zi Wei Dou Shu claims to use the position of the cosmos at the time of one's birth to make determinations about personalty, career and marriage prospects, and more. 
History.
Traditionally, Zi Wei Dou Shu is considered to have been created by a Taoist named Lu Chun Yang () during the Tang Dynasty. It was further developed by Chen Xi Yi () during the Song Dynasty and later on by Luo Hong Xian () during the Ming Dynasty to its present-day form. Its exact origin, however, is still debated among different schools.
Unlike the more commonly known Four Pillars of Destiny system of birth-chart divination, Zi Wei Dou Shu is based on a purely lunar calendar and the position of the night sky. By contrast, Bazi is tied to the sexagenary cycle system of timekeeping, which is often mapped to traditional Chinese solar terms. Some believe that this difference makes the two systems complementary rather than competitors. 
The study of destiny (, ming xue), of which Zi Wei Dou Shu is a part, has traditionally been closely intertwined with astronomy. Historically, gifted astronomers and astrologers were recruited as officials to work in Imperial Courts during the dynastic eras, producing strological charts for the emperor, as his personal fate had a direct bearing on his kingdom. The court astrologers also played an important role in determining the successor to the throne.
Astrologers observed the stars and noticed that among so many stars, only one was seemingly stationary while the rest revolved around it. This star was named the "Emperor Star" ()--the celestial equivalent of the Emperor and known in the West as Polaris. While this star in Zi Wei Dou Shu has a physical basis, the rest of the system's 'stars' are expressions of the cyclical passage of time and do not necessarily represent physical stars in the sky.
As with many other forms of fortune-telling, practitioners do not generally see the natal chart as an infallible guide as to what will happen, but more as a form of forecasting in detail. Destiny and fortune are considered structurally complex and are unlikely to be changed by a single element. An overly simplistic application of - for example - changing one's lucky colors and numbers is not expected to affect or change one's destiny in any significant way. However, practitioners believe that knowledge about future possibilities may allow one to gauge the situation in advance and make decisions from a position of strength. Zi Wei Dou Shu approaches the world and events from the idea that to view things in their proper context, it is important to recognise the "spiritual dynamic of the universe" to find the pattern of change that leads to "fundamental truth".
Zi Wei Dou Shu Chart Structure.
The 12 Palaces, or Shí Èr Gōng () are arranged and plotted in an anti-clockwise rotation. The presence of certain stars in each palace can be considered either an auspicious or inauspicious omen regarding that part of one's life. In some lineages, these palaces are also assigned phases based on the sexagenary cycle which is also used in Bazi reading.
The 14 Major Stars.
Different schools ascribe importance to the presence and strength of many different 'stars', ranging from 18 to dozens, often including interactions and transformations between these stars. However, 14 "major" stars are used consistently across different lineages: