In the BaZi system (八字, bā zì), each of the four pillars (四柱, sì zhù — "four pillars") corresponds to a specific period of life and area of being. The Year Pillar (年柱, nián zhù) is ancestors, childhood, connection to the wider society. The Month Pillar (月柱, yuè zhù) is career, parents, youth. The Day Pillar (日柱, rì zhù) is you yourself and your partner, maturity. And finally, the Hour Pillar (時柱, shí zhù) is children, legacy, the inner world, and later life.

時柱
Shí Zhù · Time Pillar / Hour Pillar
shí zhù · Hour Pillar · The Fourth of Four

1 What the Hour Pillar reveals

The Hour Pillar carries information about several important areas of life:

2 Why the exact time of birth matters

The Twelve Earthly Branches (地支, dì zhī) divide the day into 12 equal two-hour periods. A difference of a single minute can flip the Hour Branch entirely — meaning a fundamentally different Hour Pillar, a different set of hidden stems (藏干, cáng gān), and different Ten Gods.

誤 If you don't know your exact time of birth: use the rectification technique (校時, jiào shí — "time correction"). Based on key life events, a practitioner can "deduce" the most likely Hour Pillar. More on this in our separate article on rectification.

3 The 12 Hour Branches: what each hour is like

Every two hours corresponds to one of the earthly branches. Here are their traits from the perspective of the Hour Pillar:

子
Rat · Zǐ
23:00 — 01:00

The hour of dark water — deep intuition, nighttime thinking. Children are smart, introverted. Old age is quiet, contemplative. A rich inner world, invisible from outside.

丑
Ox · Chǒu
01:00 — 03:00

The hour of nighttime perseverance. Children are methodical, hardworking, sometimes loners. Later life bears fruit through accumulated labor. Inner world: values, tradition.

寅
Tiger · Yín
03:00 — 05:00

The dawn hour of the leader. Children are active, enterprising, born for leadership. Later life brings expansion, new projects. Inner world: ambition and independence.

卯
Rabbit · Mǎo
05:00 — 07:00

Sunrise. Children are gentle, diplomatic, artistic. Later life brings harmony, a beautiful home life, cultural interests. Inner world: aesthetics and a love of peace.

辰
Dragon · Chén
07:00 — 09:00

The morning of the storage vault. Children are multifaceted (the Dragon carries three hidden stems). Later life brings accumulated wisdom, spiritual growth. Inner world: complex, layered.

巳
Snake · Sì
09:00 — 11:00

The hour of insight. Children are smart, often with hidden talents. Later life can bring unexpected wealth (the Snake hides Metal 庚 and Earth 戊). Inner world: wisdom and intuition.

午
Horse · Wǔ
11:00 — 13:00

The peak of the day. Children are energetic, freedom-loving, travelers at heart. Later life stays active, full of movement. Inner world: freedom, motion, passion.

未
Goat · Wèi
13:00 — 15:00

Afternoon. Children are creative, sensitive. Later life leans on family and loved ones. Inner world: art, nurturing, caring for others.

申
Monkey · Shēn
15:00 — 17:00

The hour of cleverness. Children are smart, cunning, enterprising. Later life preserves the fruits of one's labor (the Monkey carries Metal 庚). Inner world: strategic thinking.

酉
Rooster · Yǒu
17:00 — 19:00

The sunset hour of Metal. Children are precise, perfectionist, with refined taste. Later life brings cleanliness, order, high standards. Inner world: critical judgment and elegance.

戌
Dog · Xū
19:00 — 21:00

The hour of loyalty. Children are loyal, devoted, with strong values. Later life brings protection of loved ones, spiritual practice (the Dog carries 辛 Metal and 丁 Fire). Inner world: a sense of justice.

亥
Pig · Hài
21:00 — 23:00

The night hour of stillness. Children are kind, intuitive, creative. Later life brings solitude, spiritual searching. Inner world: a deep inner life, generosity, mysticism.

4 Children in the chart: what to read in the Hour Pillar

To understand the theme of children, we look not just at the Hour Branch itself, but at the stars within the pillar:

5 How the Hour Pillar shapes later life

In BaZi tradition, the Hour Pillar governs the period after age 50–55 (the exact age depends on your specific Luck Pillars). This is the "evening of life" — a time when your career is behind you, your children are grown, and the inner world, legacy, and support from your offspring take center stage.

時柱為晚年之鏡 — "The Hour Pillar is the mirror of later life." Look into it not with fear, but with understanding: what to do now so the mirror reflects joy.

What does your Hour Pillar say?

The Full reading goes through all four pillars of your chart, including the Hour pillar 時柱, and describes what it may say about later life and legacy as testable hypotheses.

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