Timing · Two Traditions
Zodiacal releasing vs. luck pillars: two ancient maps of your peak years
Zodiacal releasing is a Hellenistic timing technique that divides a life into periods counted from the Lot of Fortune or the Lot of Spirit; bazi's luck pillars (da yun) do the same job from the month pillar, ten years at a time. In the second century CE, a working astrologer named Vettius Valens wrote down a technique for slicing a human life into chapters: which years open a career, which years peak, which years ask you to hold on and consolidate. Most of a millennium later, chart-readers in Song-dynasty China finished building a system that does exactly the same job with entirely different machinery. Neither tradition knew the other existed. Both made the same bet: that the calendar of your life, not just your character, can be computed from your birth data alone.
The Greek technique is called zodiacal releasing, and after centuries of obscurity it is back at the center of a revival in Western astrology. The Chinese one is called luck pillars (dà yùn), and it never went obscure at all: it is the backbone of every bazi reading, including the life chart our free bazi calculator draws. Put side by side, they explain each other better than either explains itself.