Ding Hai 丁亥 Day Pillar
Ding Hai 丁亥 is number 24 of the sixty. The Day Master is Ding 丁, yin Fire; the branch Hai 亥 is Water, zodiac Pig. Na Yin is Earth on the Rooftop.
At a glance
| Position in the cycle | 24 / 60 |
|---|---|
| Day Master (stem) | 丁 |
| Day branch | 亥 |
| Day Master element | yinFire |
| Branch element | Water |
| Zodiac | Pig |
| Na Yin | Earth on the Rooftop |
| Hidden stems | Ren 壬, Jia 甲 |
| Void branches | Wu 午, Wei 未 |
Hidden stems and their Ten Gods
A branch is more than its surface element. Hai 亥 hides Ren 壬, Jia 甲; read against the Day Master Ding 丁 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 |
|---|---|---|
| Ren 壬 | Water | Direct Officer |
| Jia 甲 | Wood | Direct Resource |
Next Ding Hai 丁亥 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 Ding Hai 丁亥 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 Ding 丁. Two people born in the same year and month with different day stems therefore have completely different charts. In Ding Hai 丁亥 the Day Master Ding 丁 is yin Fire and sits on Hai 亥, which is Water; 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 Ding 丁, and the other four sharing the branch Hai 亥:
Same Day Master (Ding 丁)
Same branch (Hai 亥)
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