Triple Harmonies (三合)

In BaZi astrology, the Three Harmonies (San He) (三合) is one of the fundamental interactions between Earthly Branches (地支). Three branches that form a complete elemental trine, creating powerful synergy. The three harmonies are: Shen-Zi-Chen (Water), Hai-Mao-Wei (Wood), Yin-Wu-Xu (Fire), and Si-You-Chou (Metal).

Understanding Three Harmonies (San He)

Three branches that form a complete elemental trine, creating powerful synergy. The three harmonies are: Shen-Zi-Chen (Water), Hai-Mao-Wei (Wood), Yin-Wu-Xu (Fire), and Si-You-Chou (Metal). This interaction is one of the core mechanisms through which the twelve Earthly Branches (each corresponding to a zodiac animal) influence each other dynamically. Unlike static elemental classifications, branch relations describe active relationships — energies that transform, combine, conflict, or harmonize when they meet in a chart.

Monkey-Rat-Dragon, Pig-Rabbit-Goat, Tiger-Horse-Dog, Snake-Rooster-Ox form the four great harmony triangles.

How Three Harmonies (San He) Works in a BaZi Chart

When the branches involved in Three Harmonies (San He) appear together in a person’s four pillars — or when they are triggered by annual luck cycles (Da Yun) or yearly branches — the Three Harmonies (San He) interaction activates. Its effects depend on which pillars are involved: Year-to-Day interactions affect social relationships and public life, while Month-to-Day interactions have a more personal, intimate impact.

The strength of the Three Harmonies (San He) interaction also depends on whether the involved branches are your Day Branch (spouse palace), Month Branch (career/parents), or Year Branch (ancestry/society). Each position modifies how the interaction manifests in real life.

Three Harmonies (San He) in Compatibility Analysis

The Three Harmonies (San He) interaction is crucial in relationship compatibility analysis. When two people’s charts share branches that form Three Harmonies (San He), the relationship takes on the characteristics of this interaction. Some Three Harmonies (San He) combinations create natural harmony and mutual support, while others create productive tension that challenges both partners to grow.

Three Harmonies (San He) in Timing and Luck Cycles

Beyond personality and compatibility, Three Harmonies (San He) interactions are also activated by time. When an annual branch or a Da Yun period branch triggers Three Harmonies (San He) in your chart, it signals a period when that interaction’s themes will be prominent in your life. Understanding these timing triggers helps you prepare for and navigate life transitions more effectively.

The Deeper Metaphysics

The Three Harmonies (San He) interaction reflects ancient Chinese cosmological principles that predate formalized astrology. These branch relations encode observations about natural cycles — seasonal, directional, and energetic — that the ancients mapped onto the twelve animals. The system’s enduring relevance speaks to its accuracy in describing human dynamics through the lens of natural law.