Hap, Chung, Hyeong, Pa, Hae

Five Stem combinations, six Branch harmonies, four trines, six clashes… you memorize the table and it fades by the next day. Most people who read charts never memorized it. They did not have to.

This guide asks one question: why those particular groupings? Ja (子) and O (午) clash, yet In-O-Sul forms a trine — why? The answer comes at the end. First, draw a circle.

One Circle Is All You Need

The conclusion first: place the twelve Branches clockwise around a circle. Put Ja (子) at twelve o'clock and step thirty degrees at a time through Chuk, In, Myo and the rest. That single drawing is the whole of this guide. Every Branch relation below — clash, trine, directional set, harmony — falls out of a position on this circle. (Stem combinations and the Hyeong-Pa-Hae group sit outside the circle; both come later.)

Start with clash (沖). You can see six dashed lines crossing the circle. A clash is simply a pair that sits exactly opposite. Ja-O, Chuk-Mi, In-Sin, Myo-Yu, Jin-Sul, Sa-Hae — all six are diameters. Nothing was memorized; it was read off the picture.

Clash — the Facing Seat

Clash is often taught as purely unlucky, but on the circle its character reads differently. Facing means the farthest possible distance and, at the same time, looking straight at each other. So a clash breaks and opens at once. It is read as the force that shakes a stuck position into motion.

Trine — What Thirds of the Circle Produce

On the same circle, look for equilateral triangles — connect every fourth position. The four triangles you get are exactly the trines.

A trine is read as three Branches merging into a single element. Which element it becomes is decided by the vertex where that energy peaks, the peak Branch. Sin-Ja-Jin contains Ja (子) and becomes Water; Hae-Myo-Mi contains Myo (卯) and becomes Wood.

When only two of the three are present it is read as a half-trine. The half that contains the peak Branch is generally treated as the stronger one.

Directional Sets and Harmonies — Neighbours, and a Mirror

A directional set is simpler still: three neighbouring characters on the circle. In-Myo-Jin is spring and east, Sa-O-Mi is summer and south. Season and direction are the same mapping, so three adjacent Branches naturally read as one block.

The six harmonies look different. Ja-Chuk, In-Hae, Myo-Sul, Jin-Yu, Sa-Sin, O-Mi — these are neither opposite pairs nor triangles. But draw them on the circle and a rule appears: fold the circle along the axis running between Ja (子) and Chuk (丑) and all six pairs land on each other.

Stem Combinations — Five Pairs and Transformation

Everything above concerned Branches. The Stems have combinations too — five pairs. When one forms, a new element is said to arise, which is called transformation. Whether a transformation actually completes depends on conditions, and schools disagree about which conditions those are.

Stem combinations do not form only at the Day Master. They form wherever two of the four Stems are both present — the pillars do not have to be adjacent (closer placement is read as a stronger effect, not a requirement). A combination touching the Day Master simply carries more weight in interpretation, because that is the seat that stands for the self.

The Remaining Three — Hyeong, Pa, Hae

Of the five relations named together, Hyeong, Pa and Hae do not resolve cleanly into circle geometry. They have more combinations and more interpretive disagreement. Here is what each one points at; the combination-by-combination treatment lives in its own guide.

The full combination list for those three is in the Hyeong, Pa, Hae deep dive. If the generating and controlling cycles themselves are unclear, start with the Five Elements guide; if you want to revisit what Stems and Branches are, the Stems and Branches basics comes first.

One Page Summary

What I Verified While Making This

Once the circle framing was chosen, the first job was checking whether the symmetry actually holds for every pair. Clashes and trines fell into place immediately: every clash pair differed by exactly 180 degrees, and all four trines came out at 120 degrees per step.

The harmonies were the sticking point. They are neither opposite nor triangular, and the draft was going to call them "the one exception." Then I added the two angles of each pair together: Ja-Chuk 30, In-Hae 390, Myo-Sul 390 — all of them 30 degrees once a full turn is subtracted. A constant angular sum means mirror symmetry about a single axis. They were not an exception but the same rule wearing another face, which is why the claim that position is the rule could be extended to the harmonies as well.

Find Them in Your Own Chart

What you need now is your own eight characters. Open your chart in the Mystic Universe Saju reading and the Stems and Branches of all four pillars are laid out. With the circle in mind, look for facing pairs and for characters clustered at the thirds.

Reading combinations between two people is a different matter — how meaning shifts by seat is covered separately in the Saju compatibility guide.

Two questions worth asking of the result. First, if there is a facing pair in your chart, which pillar does it sit on? Second, if a trine or directional set has merged into one element, is that element already abundant in your chart or scarce?

Open my Saju chart

Sources and Editorial Note

The five Stem combinations and their transformation elements come down through the Yuanhai Ziping lineage, which organized the Day Master-centered system. That text is transmitted as a compilation by Xu Dasheng of the Southern Song, but authorship and compilation are disputed, so this guide names no single founder.

Two peer-reviewed Korean papers indexed in KCI informed the modern side. Lee Jae-seung, "A Study on Differences in Combining Force of Earthly Branches by Combination and Clash in Myeongri" (Humanities and Social Sciences 21, 12-6, 2021) treats variation in combining force, which is why the relative strength of a half-trine is written here as "is read as" rather than stated flatly. "A Study on the Application of the Heavenly Stem Combination and Clash Theory" classifies the conditions under which transformation does or does not complete, which is the basis for saying transformation depends on conditions.

The circular diagram takes the already-fixed directional and seasonal mappingof the twelve Branches and plots it as coordinates. While writing, I placed the twelve at thirty-degree intervals and computed the angular differences of the six clash pairs, the spacing of the four trines, and the angular sums of the six harmony pairs, checking each against the received lists. The coordinates in the diagram are computed from those angles rather than placed by hand. Points where schools disagree — the conditions for transformation, the relative strength of a half-trine — are written as "is read as" rather than stated flatly.

This article introduces an interpretive tradition rooted in classical philosophy. It does not predict or guarantee any specific event or outcome.