When two people bring their charts together, one comparison carries unusual weight: their day branches. The day branch is the spouse palace, the seat of close partnership, so bazi day branch compatibility asks a direct question — when your two seats meet, do they clash, combine, harm, or simply coast alongside each other? None of the four is a verdict. Each is a description of the friction or ease a relationship tends to carry.
This is one layer of compatibility, not the whole of it. But because the day branch sits directly beneath each Day Master (日主 rìzhǔ), the way two of them interact is felt intimately, and it is a sensible place to begin.
First, find your day branch — it is not your animal sign
A caution before the tables, because this is where most people stumble. The animal you know from birthday folklore is your year branch. The branch that matters here is the day branch, the lower character of your day pillar, and there is no shortcut for finding it — the sixty-day cycle pays no attention to birthdays or calendar months. Plot your chart with the free calculator and read the bottom character of the day column; do the same for your partner.
The two branches you now hold are also “animals” — every branch is — but they are the intimate pair, not the public one. Two people whose year animals supposedly clash may carry day branches that combine, and the day-branch signal weighs more for partnership because it sits in the marriage seat itself.
The four ways two day branches meet
Between any two Earthly Branches (地支 dìzhī) there are a handful of fixed relationships. For compatibility, four matter: the clash, the combination, the harm, and the neutral case of coasting. The first three come straight from the standard reference lists; the fourth is simply the absence of the others.
When day branches clash
A clash (冲 chōng) is two branches sitting directly opposite on the cycle. Between partners it reads as a lively, high-friction pairing — attraction and irritation in the same breath, a relationship that moves and changes rather than settles. It is not a sentence of failure; many long marriages carry a day-branch clash and simply run hotter.
| Clash pair | Animals |
|---|---|
| 子 ↔ 午 | Rat and Horse |
| 丑 ↔ 未 | Ox and Goat |
| 寅 ↔ 申 | Tiger and Monkey |
| 卯 ↔ 酉 | Rabbit and Rooster |
| 辰 ↔ 戌 | Dragon and Dog |
| 巳 ↔ 亥 | Snake and Pig |
When day branches combine
A combination (合 hé) is two branches that bind and, under the right conditions, pull toward a shared element. Between partners it reads as natural attraction and cohesion — a magnetic, easily-bonded pairing. The caution is that a combination can also “tie up” a branch, so a bond this strong sometimes makes two people slow to act apart. Ease is not the same as growth.
| Combination | Transforms toward |
|---|---|
| 子 + 丑 | Earth |
| 寅 + 亥 | Wood |
| 卯 + 戌 | Fire |
| 辰 + 酉 | Metal |
| 巳 + 申 | Water |
| 午 + 未 | Fire/Earth |
When day branches harm — or coast
A harm (害 hài) is quieter than a clash: an undermining, a friction with a personal edge rather than a collision. Between partners it can read as low-grade grievance or the sense of being subtly undercut, and it rewards being named openly rather than left to work in the dark.
| Harm pair | Animals |
|---|---|
| 子 ↔ 未 | Rat and Goat |
| 丑 ↔ 午 | Ox and Horse |
| 寅 ↔ 巳 | Tiger and Snake |
| 卯 ↔ 辰 | Rabbit and Dragon |
| 申 ↔ 亥 | Monkey and Pig |
| 酉 ↔ 戌 | Rooster and Dog |
If two day branches share none of these relationships, they coast. That is not a bad result. A coasting pair carries neither the heat of a clash nor the pull of a combination — steadier, more independent, a partnership that neither collides nor fuses. Many durable pairings sit exactly here.
A worked comparison
Suppose one partner’s day branch is Sì 巳 (Snake) and the other’s is Shēn 申 (Monkey). Check the tables in order: no clash, but 巳 + 申 appears in the combination list, pulling toward Water. The seats bind — a natural attraction reading. A careful reader notes one more thing: 寅 ↔ 巳 and 申 ↔ 亥 both sit in the harm list, so if either chart also carries a Tiger or Pig branch elsewhere, that third branch complicates the picture. This is why the pair reading is a beginning, not an ending: the rest of each chart, and the years passing over both, keep speaking.
Reading Ba Zi day branch compatibility in context
The classic mistake is to reduce two whole people to two animal signs and stop there. Bazi day branch compatibility is one layer. The hidden stems inside each branch, the Day Master relationship, and each person’s favourable elements all shade the picture, and a single clash is often outweighed by harmony elsewhere. In practice we also check whether a luck pillar or the current year is clashing or combining either day branch, because a pairing that coasts for years can turn lively when the cycles move.
Read this alongside the seat it describes in the spouse palace guide, and within the fuller method laid out in the plain-English compatibility guide. The underlying mechanics of these pairings are detailed in the six clashes and the six combinations.
Two charts interact in more places than one, and the day branch is only the opening move. If you want yours compared with a partner’s properly — both palaces, both day branches, and the elements underneath — a Butcher Boy reading puts both charts on the table for an hour and sends you away with a written summary, read plainly and without fear-selling.