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How it differs from Western astrology and BaZi
The same wish to understand a life from its first moment, drawn as very different maps.
Western astrology starts from where the real Sun, Moon and planets stood in the zodiac when you were born, and divides the sky into twelve houses. Zi Wei Dou Shu starts from the Chinese calendar instead: your lunar birth date and hour decide which cell holds each palace and where each named star goes.
Both speak of twelve areas of life, which makes them easy to compare. A Zi Wei chart, though, is read mainly through its stars, through how palaces face and support each other, and through four “transformations” that tint four stars in every chart.
BaZi, or Four Pillars, writes the same birth data as eight characters (stems and branches) and reads the balance of the five elements. Zi Wei Dou Shu places stars into palaces. Many practitioners use both, the way a doctor might look at two different scans of the same person.
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Because the positions come from calendar rules, two people born in the same two-hour period of the same lunar day, with the same gender, share the same chart. That is one reason the birth hour matters so much here.
The sky of Zi Wei Dou Shu is a sky of officials, generals and households, which is why stars have names like the Emperor, the Treasury or the Minister. The pictures are cultural; the questions they raise, such as how you lead, how you rest and how you love, belong to everyone.