Si (巳), the Snake Branch: Yin Fire, Hidden Stems & Si–Hai Clash

TWELVE EARTHLY BRANCHES

Branch 6 of 12

巳SiYin Fire

Yin Fire
Snake
Early Summer
09:00–11:00

Zodiac animal: Snake
Month: Start of Summer
Hour: 09:00–11:00

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Si is the sixth Earthly Branch and the first branch of summer. It is a Yin branch whose interior is entirely Yang: Yang Fire leads, followed by Yang Earth and Yang Metal. Those three layers form a conversion chain—Fire produces Earth, Earth produces Metal—so Si is not only heat; it is heat organised to change material from one state into another.

At a glance

Element: Yin Fire
Zodiac animal: Snake
Hidden stems: Yang Fire · Yang Metal · Yang Earth
Month: Start of Summer · 05/05–06/05
Hour: 09:00–11:00
Direction: South-southeast
Seasonal frame: Summer · 巳午未
Three Harmony frame: 巳 · 酉 · 丑 → Metal

The closed furnace

Si concentrates before it discloses. Like a kiln with a small viewing port, it watches pressure, timing and weak points inside the process before opening the door.

Conversion work

Its strength lies between stages: turn an idea into a method, a method into an output, and an output into a tool. The hidden elemental chain rewards sequence more than spectacle.

Release the premise

A well-kept plan can become unreadable to everyone else. State the assumption, the stop temperature and the next review time; strategy becomes usable when others can see what would change it.

What is hidden inside

Stems hidden in 巳

Yang Fire

Yang Metal

Yang Earth

Yang Fire50%
Primary qi · Fire
Yang Metal33%
Middle qi · Metal
Yang Earth17%
Residual qi · Earth

Si contains three Yang stems inside a Yin branch: Yang Fire as main qi, Yang Earth as middle qi and Yang Metal as residual qi. The 50/33/17 display is the engine's common 3:2:1 root-weight model, not a literal recipe for the branch.

Where it falls in the year and in the day

Twelve months, from Start of SpringStart of Summer · 05/05–06/05

Twelve hours, from midnight09:00–11:00

The Si month runs from Beginning of Summer to Grain in Ear (about May 5–Jun 5), when heat is establishing command. Si hour is 09:00–11:00: the sun is high enough for sustained work but has not reached noon. Both positions describe rising capacity that still has time to choose its form.

Animated twelve-branch clock stopping on Si, the 09:00 to 11:00 sector — The twelve-branch clock settles on Si, 09:00–11:00. Chen behind it completed spring's handover; Wu ahead will expose Fire at noon. Si is the two-hour chamber in which heat gathers, tests and converts.

巳 and the other eleven

Si–Shen are a Six Harmony pair assigned to Water, and they are also one edge of the punishment triangle. Combination and punishment can coexist: close coupling does not guarantee compatible methods, and neither label erases the other.

巳 · 申Water

巳 in each of the four pillars

Year branch

Si in the year branch may place close observation, technical competence or carefully timed disclosure in the early environment. What mattered was often knowing when to reveal a move, not merely having one.

Month branch

Si in the month branch puts early-summer Fire in seasonal command. The chart must show where the heat travels: Earth can receive its output, Metal inside Si needs conditions to survive refinement, and Water may regulate temperature without extinguishing useful work.

Day branch — spouse palace

Si in the day branch places Yang Fire, Yang Earth and Yang Metal in the spouse palace. Relationships can revolve around solving and building; sharing the premise before presenting the solution prevents competence from feeling like control.

Hour branch

Si in the hour branch can store a private technical or strategic agenda behind visible daily work. Scheduled demonstrations turn accumulated skill into something successors can learn, instead of knowledge that remains inside one operator.

The five 巳 day pillars

Each stem that can sit on this branch makes a different pillar. Open one for the full profile.

A classical note

Si means that Yang qi has reached its full extent.

Records of the Grand Historian, Treatise on Pitch Pipes

Here, reaching the full extent does not mean that Yang has vanished. It means its seasonal deployment is complete and summer heat is established; Wu will mark the next crossover at noon. The line describes a stage of qi, not a Snake personality or a guaranteed life event.

Frequently asked questions

What does Si mean in a BaZi chart?

Si is a Yin Fire branch and the Snake sign. It marks 09:00–11:00, the month from Beginning of Summer to Grain in Ear and the south-southeast. Its hidden stems are Yang Fire, Yang Earth and Yang Metal.

Why does a Yin branch contain three Yang stems?

Branch polarity and hidden-stem polarity describe different layers. Si's outer branch is Yin, while all three stored stems are Yang. The combination is not an error and should not be simplified into either 'quiet Yin' or 'pure Yang'; the full chart decides how the concentrated interior is expressed.

How can Si and Shen be both Six Harmony and punishment?

The relation tables describe different kinds of interaction, so one pair can carry both. Si–Shen can bind closely while producing procedural tension. Neither relation automatically wins; season, position, repeated branches and the chart's useful elements determine which effect matters.

Is a Si–Hai clash always bad?

No. Fire and Water oppose each other and both branches carry movement, so the clash can expose conflicting routes, travel demands, information flows or schedules. It may correct a closed strategy, or destabilise a process that already lacks direction.

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Si — Heat with an Inner Sequence