The App "Zi Wei Dou Shu", is an essential useful, a "must have" professional tool for Professionals consultants, astrologers, but also useful for the beginners. Zi Wei Dou Shu is variously called as the "Purple Star Astrology Calculation", the Purple Planet Constellation, Purple Star Astrological System or Polar Star Astrology. This ancient astrological system was created by Lu Dong Bin ( ) and written down during Song Dynasty (960-1280 AD) by the Master Astrologer and a great philosopher, Chen Xi Yi ( ). Although Ziwei Dou Shu has achieved the goal of providing strong competition to Zi Ping Ba Zi (Four Pillars) because it is in the capacity to give enormous specific details, the methodology did not flourish for the next 1.000 years it has been the exclusive instrument of the Bureau of Astronomy of the Ming and Qing Dynasties, used to serve only the Emperor. Therefore, Zi Ping Bazi was the only well known main stream destiny analysis method until the recent times, some masters began teaching Zi Wei Dou Shu openly after World War II. Since Zi Wei Dou Shu first appeared in the Song Dynasty, hence, it has a history of slightly more than 1.000 years. This Zi Wei Astrological System is charted into a "Ming Pan ( )" or known as the Personal Life Chart using the Four Pillar of Destiny (birthday, hour and gender of birth of a person). No need to worry about calendar conversions either, it also converts Western (Gregorian) calendar into Chinese Lunar Dates. 1) Zi Wei Dou Shu Calculator: Find the Chinese Lunar Month and Day, or on any date you want with absolute precision, taking into consideration the Longitude and Time Zone of the area. 2) Ba Zi - Four Pillars Pro Calculator: Dong Gong Date Selection and Special Day info Stems Relationships Earthly Branches Relationships 64 Hexagrams Auxiliary Stars Strengthening of the Day Master Qi Men Dun Jia Destiny Palace Xuan Kong Da Gua Combinations !!! We're always listening, so please send comments, suggestions and words of encouragement. !!!