Jia Zi (甲子)

寒江古木 · Ancient Tree by the Cold River

Published 2026-09-12

Jia Zi (甲子) is one of the sixty day pillars of Chinese astrology: Yang Wood standing on the Rat branch, nayin Gold in the Sea. Its traditional image is Ancient Tree by the Cold River — Still water runs deep — so do these roots.

Hidden stems are the stems stored inside the branch, each read as a Ten-God relation to the day stem. Self-seat is the stem’s Twelve-Stage position on its own branch (“Stillness” and “Storage” are phases, not verdicts). Emptiness marks the two branches left vacant by this pillar’s ten-day cycle. Conventions: method.

Why is 甲子 “Ancient Tree by the Cold River”?

This is the first pillar of the sixty, and it opens on winter. Jiǎ (甲) is yang Wood, timber, the trunk that only grows upward. Zǐ (子) is the Rat branch, deep water, midnight on the day's clock — and it stores one stem only, 癸, water and nothing else. So the tree stands in cold water at the darkest hour of the cycle, being fed the entire time. Water grows wood. Nothing here is hostile. But water in winter does not push a tree upward; it goes down into the root, where no one can see it, and the visible part of the year stays bare. A tree by a cold river is not a tree in trouble. It is a tree whose work that season is happening below the waterline. Hence 寒江古木, Ancient Tree by the Cold River.

What is a Jia Zi person like?

Ask them what they have been working on and the answer will be smaller than the truth. Not modesty — they genuinely cannot see the point at which preparing turns into having prepared, so a thing three years deep gets described as something they have been looking into. The people who have known them longest are the ones who keep being surprised. The harder half: told to ship the rough version now, they will agree, and then not do it, and the reason they give will be a real reason every time. There is always one more layer of root available. Look for the project that was ready two winters ago and is still being made ready. Rooted deepest, slowest to say the word ready. 甲子 does its work below the waterline.

What is inside the pillar?

Among the sixty, 甲子 is one of the few pillars whose branch stores a single stem. That stem is 癸, yin Water, and against a 甲 Day Master it reads as Direct Resource (正印) — the supporting, teaching, nourishing relation, arriving undiluted because there is nothing else in the seat to argue with it. No Wealth stored here, no Officer: nothing in the pillar asks the wood to produce or to answer to anyone. 甲 on 子 is Bath (沐浴), the second of the twelve stages, the position right after birth where a stem is being washed and is not yet load-bearing. That pairing is the mechanism worth sitting with — maximum support at minimum readiness, which is how a root system gets built and also how a launch date keeps moving. The 空亡 here covers 戌 and 亥. Its nayin, shared with 乙丑, is Gold in the Sea (海中金) — metal that indisputably exists, at a depth where nobody has yet reached down for it.

What does 2026 (丙午) mean for a Jia Zi day pillar?

In 2026, the year pillar is 丙午. Read against 甲 as the Day Master, the year stem is the Eating God and the year branch reads as the Hurting Officer. The year branch 午 clashes (冲) with 子. These are table facts about one pillar, not a forecast: the same year lands differently on two people who share a day pillar, because the other six characters differ.

Every cell above is derived at build time by the same modules that compute the chart — nothing here is written per year by hand, so it cannot drift out of date while the page stays live. One convention worth knowing: a BaZi year turns at lìchūn (立春, around 4 February), not on 1 January, so a date in late January still belongs to the previous year pillar (our conventions).

Is this the whole chart?

No — the day pillar is one of four, and everything above is the picture of one pillar, not a verdict on a person. Whether the furnace in your chart burns hot or barely at all depends on the other six characters and the season you were born in (how we weigh that is public). Read the image, then check it against a real memory: it should argue with you or agree with you. Both are useful. Cast your chart to see this pillar in its full context — free, no account.

Jia Zi is one of sixty pictures — the full table is on the day pillar index. The stem on top is your Day Master; the imagery layer is the nayin system. Auspice is for reflection, not prediction.