Yi You 乙酉 Day Pillar
Yi You 乙酉 is number 22 of the sixty. The Day Master is Yi 乙, yin Wood; the branch You 酉 is Metal, zodiac Rooster. Na Yin is Water in the Spring.
At a glance
| Position in the cycle | 22 / 60 |
|---|---|
| Day Master (stem) | 乙 |
| Day branch | 酉 |
| Day Master element | yinWood |
| Branch element | Metal |
| Zodiac | Rooster |
| Na Yin | Water in the Spring |
| Hidden stems | Xin 辛 |
| Void branches | Wu 午, Wei 未 |
Hidden stems and their Ten Gods
A branch is more than its surface element. You 酉 hides Xin 辛; read against the Day Master Yi 乙 they give the Ten God relations below. Hidden stems are what element strength is actually judged on — counting only the four visible stems badly understates what the branches carry.
| Hidden stems | Day Master element | Ten God |
|---|---|---|
| Xin 辛 | Metal | Seven Killings |
Next Yi You 乙酉 days
Day pillars run on a fixed 60-day cycle independent of month and year. The dates below are derived straight from the day count, so no calendar reform affects them.
- Calculating…
Where Yi You 乙酉 sits in a chart
The day pillar is the only one read from itself — every Ten God in the year, month and hour pillars is defined relative to the Day Master Yi 乙. Two people born in the same year and month with different day stems therefore have completely different charts. In Yi You 乙酉 the Day Master Yi 乙 is yin Wood and sits on You 酉, which is Metal; the relation between them is branch controls the Day Master. This seat is classically read as the Day Master's immediate environment.
Related pillars
The other five pillars sharing the Day Master Yi 乙, and the other four sharing the branch You 酉:
Same Day Master (Yi 乙)
Same branch (You 酉)
Sources
- lunar-javascript (6tail, MIT) — solar-term instants, 干支 pillars, 大運/流年, 胎元/命宮/身宮 and the almanac tables.
- Hong Kong Observatory, Date and Time of the 24 Solar Terms — the reference used to check solar-term instants.
- Xieji Bianfang Shu and Sanming Tonghui — classical sources for the Wuhu Dun and Wushu Dun stem rules, hidden stems and the Ten Gods.
Algorithms last checked: 2026-07 · Method and accuracy