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Ziwei Doushu (Purple Star Astrology) is said to have been created by a Taoist immortal during China's Tang Dynasty as a secret imperial divination. It is an elaborate system that reads fate by placing 108 stars on a destiny chart. The Purple Star (Ziwei) symbolizes the North Star and is called the Emperor's Star. This technique, once secretly used only in the imperial court, has now been revealed to the modern world.