乙酉 Day Pillar — Yi Yin Wood Day Master (you Rooster)
The yi you (乙酉) day pillar means you are a Yi Yin Wood day master sitting on the you (Rooster, 金) branch. Its nayin is Water in the Spring (泉中水). Below: what the stem says, what the branch adds, and how the pair interacts.
The 乙酉 day pillar at a glance
| Position in the cycle | No. 11 of the 60 day pillars |
|---|---|
| Day master (heavenly stem) | 乙 — Yi Yin Wood (Wood) |
| Day branch (earthly branch) | 酉 — you, the Rooster (Metal) |
| Hidden stems | 辛 (Xin Metal) |
| Nayin | Water in the Spring (泉中水) |
| Stem–branch relation | the branch pressures the stem |
What the day pillar means in BaZi
In the Four Pillars of Destiny (BaZi), the day pillar is the pillar of the self: its heavenly stem is your day master, the element that represents you, and its earthly branch is the ground you stand on, closest to your inner life and (traditionally) your marriage palace. All other pillars are read in relation to the day stem. That is why the 60 day pillars are the most-asked-about combinations in Chinese astrology: one glance at this one character pair already sketches a person.
The day master: Yi Yin Wood (乙)
Yi is the vine and the flowering stem: softer in form, tougher in survival. This day master adapts to whatever structure surrounds it, wins by flexibility and timing rather than force, and holds on where harder characters snap.
The day branch: you Rooster (酉, 金)
You is the Rooster: pure refined metal, nothing hidden. As a day branch it adds precision, strong opinions about quality, and a sharp eye.
The you branch hides Xin Metal, which the full chart reads as secondary characters underneath the surface.
How the stem and branch interact
The branch presses on the stem in the controlling cycle: strength here is earned under load, and the chart rewards the discipline that pressure teaches.
What it is like when Yi Yin Wood sits on you
The branch presses on the day stem: the controlling cycle runs from the ground upward, so the environment leans on the self. Classical reading names this configuration officer or pressure — the element that governs you — and treats it as discipline rather than damage: strength earned under load. Traditional commentary notes that people with this pairing often perform well inside structure, deadlines and responsibility, precisely because the load is already there. The caution is the same configuration read passively: pressure unchosen feels like fate, pressure chosen feels like training. The classics come down firmly on choosing it.
Taken together, the 乙酉 day pillar sketches a Yi Yin Wood day master whoseyou ground tests it. Classical commentary always adds the same caveat: a day pillar is one character pair in a four-pillar chart, and the month branch — the season your chart was born into — can strengthen or exhaust any stem. Treat everything on this page as the first paragraph of the reading, never the whole of it.
The nayin of 乙酉: Water in the Spring
In the classical sexagenary verse system (nayin), the 乙酉 pillar is Water in the Spring (泉中水). The nayin system assigns one of thirty poetic images to the sixty pillars two at a time: 乙酉 shares its image with 乙亥, its neighbour in the cycle. The image belongs to a different element than the stem itself — nayin is a second, older layer of description laid over the pair.
Traditional commentators used the nayin image to summarise a pillar's texture rather than to compute with it. Water in the Spring is read as exactly that — an image of how the Yi Yin Wood / you combination feels from the outside. Treat it as flavour, not as a separate engine.
乙酉 elsewhere in the chart
The 乙酉 pairing does not only appear as a day pillar. The same stem-branch pair can occupy the year, month or hour pillar, and classical reading shifts its role with the seat: in the year pillar it describes the background — family atmosphere, early environment, the generational weather; in the month pillar, the season that sets the whole chart's balance, alongside the world of siblings, peers and career structure; in the hour pillar, the late chapters, children and private ambitions. When the same pair shows up in two seats, commentators read a doubling of its character — the themes above get a larger stage. If 乙酉 appears in your chart at all, it is worth knowing this page even if it is not your day pillar.
Find your own day pillar
Your day pillar comes from your birth date (the day changes at midnight, and in classical practice the hour matters for the other three pillars). The free BaZi calculator on this site computes your four pillars, hidden stems and ten gods locally in your browser, no sign-up needed. If your result shows 乙酉 on the day pillar, this page is you.
Frequently asked questions about the 乙酉 day pillar
It means your day master is Yi Yin Wood (乙) and it sits on the you(Rooster) branch. The stem describes your core character; the branch describes the ground under it. Their combination (the branch pressures the stem) is the first sketch of how you carry that character.
It is the anchor, not the whole picture. Practitioners weight the day stem most heavily because every other element is judged from its position, but the month branch (your season) and the luck pillars tell you when that character gets its chances. Read all four pillars together.
Check the heavenly stem of your birth day. A free chart calculationtakes seconds; if the day pillar reads 乙酉, the description on this page applies to you. Your stem repeats every ten days, but the 乙酉 pairing comes around once in the full sixty-day cycle.
Two answers, both classical. By the stem: the day master is Yi Yin Wood, a Wood day master, and that is the element practitioners count first. By the branch: the you below it is Metal. In the nayin verse system the pair as a whole counts as Water in the Spring (泉中水).
Once every sixty days. Days run in an unbroken sexagenary cycle — ten stems cycling against twelve branches, same-polarity pairs only — so each of the 60 pairings, 乙酉 included, falls on one day per full cycle. That fixed rhythm is why a birth date alone pins the day pillar down exactly.
Water in the Spring (泉中水). The nayin system assigns thirty images to the sixty pillars two at a time, so 乙酉 shares the image with 乙亥, the neighbouring pillar in the cycle. It is read as a poetic summary of the pair's texture, not as a separate calculation.