The foundational rule that fixes the entire sequence of your ten-year destiny cycles in Four Pillars astrology.
In BaZi (Four Pillars / Korean Saju), your Da Yun (大運, ten-year luck pillars) run forward (顺行, shun xing) if you are a Yang-year male or Yin-year female, and backward (逆行, ni xing) if you are a Yin-year male or Yang-year female — a structural rule fixed at birth by two facts alone: your sex and the Yin/Yang polarity of your birth year’s Heavenly Stem.
Every BaZi chart is built from four pillars — Year, Month, Day, Hour — each pairing a Heavenly Stem (天干, tiān gān) with an Earthly Branch (地支, dì zhī). The Da Yun (大運) system layers up to eight additional pillars on top of those four, each governing a ten-year window. Which direction those pillars count through the solar-term calendar is determined at birth by exactly two fixed facts:
The rule originates in the Zi Ping (子平) lineage of classical BaZi. Yang-year males and Yin-year females count forward (顺行, shùn xíng); Yin-year males and Yang-year females count backward (逆行, nì xíng). The direction is fixed at birth and cannot change.
The ten Heavenly Stems cycle in fixed order: Jia (甲) → Yi (乙) → Bing (丙) → Ding (丁) → Wu (戊) → Ji (己) → Geng (庚) → Xin (辛) → Ren (壬) → Gui (癸), then repeat. Odd-position stems — Jia, Bing, Wu, Geng, Ren — are Yang. Even-position stems — Yi, Ding, Ji, Xin, Gui — are Yin.
Critical boundary note: In BaZi the year changes at Lichun (立春, Start of Spring), which typically falls on February 3–5, not on Lunar New Year. Anyone born in late January or early February must confirm whether their birth date falls before or after that year’s Lichun to assign the correct stem and therefore the correct direction.
| Year | Heavenly Stem | Polarity | Male direction | Female direction |
|---|---|---|---|---|
| 2026 | Bing (丙) | Yang | Forward | Backward |
| 2025 | Yi (乙) | Yin | Backward | Forward |
| 2024 | Jia (甲) | Yang | Forward | Backward |
| 2023 | Gui (癸) | Yin | Backward | Forward |
| 2022 | Ren (壬) | Yang | Forward | Backward |
| 2000 | Geng (庚) | Yang | Forward | Backward |
| 1990 | Geng (庚) | Yang | Forward | Backward |
| 1985 | Yi (乙) | Yin | Backward | Forward |
| 1980 | Geng (庚) | Yang | Forward | Backward |
Your birth month pillar in the sexagenary (60-cycle) calendar is the anchor. The Da Yun pillars extend outward from it:
Two people born in the same month — one running forward, one backward — face entirely different elemental forces during what appears to be the same life stage. A forward runner in their forties might enter a Water-dominated pillar that clashes with a Fire Day Master; the backward runner at the same age could be in a Wood pillar that feeds that same Fire. The practical interpretations diverge completely.
Direction also determines which adjacent solar term (節, jié) you count toward when computing the starting age:
Conversion: 3 days = 1 year of starting age. One leftover day = 4 months; two leftover days = 8 months.
A full chart lists eight Da Yun pillars covering roughly 80 years from the starting age. Practitioners further track each pillar’s ten annual sub-cycles (流年, liú nián) and the ten-month minor cycles (小運, xiǎo yùn) within it, but all of those analyses rest on the direction and starting age being correct first.
A direction error cascades through every pillar. If someone’s correct sequence places a Metal-dominated pillar during their forties but the practitioner assigned the wrong direction, the chart may instead show a Wood pillar — an entirely different set of interactions with the natal Day Master, the hidden stems, and the annual branches. For births near the Lichun boundary, a one-year stem assignment error can flip direction entirely and shift the starting age by several years, misaligning the entire life narrative.
This is why a precise reading must verify the exact birth date and time, the correct Lichun cutoff, and the confirmed stem polarity before any Da Yun interpretation is attempted.
How do I know if my birth year is Yang or Yin in BaZi?
The Yang stems are Jia (甲), Bing (丙), Wu (戊), Geng (庚), and Ren (壬). The Yin stems are Yi (乙), Ding (丁), Ji (己), Xin (辛), and Gui (癸). Use the table above for recent years. If you were born in late January or early February, verify whether your date falls before or after Lichun (立春, typically February 3–5), because BaZi uses Lichun — not Lunar New Year — as the year boundary.
What does “forward” versus “backward” Da Yun actually mean in practice?
Forward (顺行) means each Da Yun pillar takes the next month pillar in the 60-cycle sexagenary calendar after your birth month. Backward (逆行) takes the preceding month pillar. From birth month Ding Hai (丁亥, position 24): forward yields Wu Zi (戊子, position 25) as the first Da Yun; backward yields Bing Xu (丙戌, position 23). These are different stems and branches, producing different elemental interactions across every decade of life.
Does running luck pillars backward mean worse luck?
No. Direction is a structural calculation, not a quality rating. Neither forward nor backward is inherently better or worse. Whether any specific pillar is favorable depends entirely on how its Heavenly Stem and Earthly Branch interact with your Day Master and the elemental balance of your natal chart.
How is the Da Yun starting age derived from the solar terms?
Count the days between your birth date and the nearest solar term in your direction — next for forward, previous for backward. Divide by 3: every 3 days equals 1 year of starting age; 1 leftover day equals 4 months; 2 leftover days equal 8 months. Your Da Yun then runs in ten-year intervals from that age.
Can a man and a woman born in the same month have completely different Da Yun sequences?
Yes, whenever they share the same birth-year polarity. A Yang-year male runs forward while a Yang-year female from the same month runs backward. The same birth-month anchor produces opposite sequences, so every subsequent decade differs entirely in its elemental character even if their natal four pillars look similar on paper.
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