结构 · 第四柱
时支由你落在哪个两小时时段决定；时干由日干按一条只有五个起点的规则推出来。十二个时支乘五个起点恰好是六十——和日柱用的是同一套六十甲子。
The twelve branches each occupy two hours. Note that the Zi block straddles midnight: it begins at 23:00, not at 00:00.
| 时支 | 时钟区间 | 时支五行 | 藏干（本气在前） |
|---|---|---|---|
| 子 Zi, Rat | 23:00–01:00 | Water | 癸 |
| 丑 Chou, Ox | 01:00–03:00 | Earth | 己 癸 辛 |
| 寅 Yin, Tiger | 03:00–05:00 | Wood | 甲 丙 戊 |
| 卯 Mao, Rabbit | 05:00–07:00 | Wood | 乙 |
| 辰 Chen, Dragon | 07:00–09:00 | Earth | 戊 乙 癸 |
| 巳 Si, Snake | 09:00–11:00 | Fire | 丙 庚 戊 |
| 午 Wu, Horse | 11:00–13:00 | Fire | 丁 己 |
| 未 Wei, Goat | 13:00–15:00 | Earth | 己 丁 乙 |
| 申 Shen, Monkey | 15:00–17:00 | Metal | 庚 壬 戊 |
| 酉 You, Rooster | 17:00–19:00 | Metal | 辛 |
| 戌 Xu, Dog | 19:00–21:00 | Earth | 戊 辛 丁 |
| 亥 Hai, Pig | 21:00–23:00 | Water | 壬 甲 |
The rule is one line: the day stem fixes the stem of the Zi hour, and the rest follow the blocks in order. The table below is not a copied mnemonic — it was produced by computing every day from 1984 onward until all ten day stems had been observed, and the build asserts that the two stems in each group agree.
| 日干组 | 子时天干 | 实算样本 |
|---|---|---|
| 甲 Jia · 己 Ji | 甲 Jia | 1984-01-01 → 甲午 Jia Wu · 甲子 Jia Zi |
| 乙 Yi · 庚 Geng | 丙 Bing | 1984-01-02 → 乙未 Yi Wei · 丙子 Bing Zi |
| 丙 Bing · 辛 Xin | 戊 Wu | 1984-01-03 → 丙申 Bing Shen · 戊子 Wu Zi |
| 丁 Ding · 壬 Ren | 庚 Geng | 1984-01-04 → 丁酉 Ding You · 庚子 Geng Zi |
| 戊 Wu · 癸 Gui | 壬 Ren | 1984-01-05 → 戊戌 Wu Xu · 壬子 Ren Zi |
Five starting points, each walking twelve blocks, give 5 × 12 = 60 hour pillars — exactly the sixty-pillar cycle, no more and no less. The build checks that identity, so the table cannot be half right.
The example chart is 1985-07-04, a 甲辰 Jia Chen day (day stem 甲). The same chart born at dawn, at noon or at night has a completely different fourth pillar:
| 时支 | 时柱 | 时干 |
|---|---|---|
| 子 Zi, Rat | 甲子 Jia Zi | 甲 Jia |
| 丑 Chou, Ox | 乙丑 Yi Chou | 乙 Yi |
| 寅 Yin, Tiger | 丙寅 Bing Yin | 丙 Bing |
| 卯 Mao, Rabbit | 丁卯 Ding Mao | 丁 Ding |
| 辰 Chen, Dragon | 戊辰 Wu Chen | 戊 Wu |
| 巳 Si, Snake | 己巳 Ji Si | 己 Ji |
| 午 Wu, Horse | 庚午 Geng Wu | 庚 Geng |
| 未 Wei, Goat | 辛未 Xin Wei | 辛 Xin |
| 申 Shen, Monkey | 壬申 Ren Shen | 壬 Ren |
| 酉 You, Rooster | 癸酉 Gui You | 癸 Gui |
| 戌 Xu, Dog | 甲戌 Jia Xu | 甲 Jia |
| 亥 Hai, Pig | 乙亥 Yi Hai | 乙 Yi |
The late Zi hour belongs to the next day under the mainstream convention, so the day pillar and the hour pillar move together. Two births two minutes apart can land on different day pillars:
| 出生时刻 | 日柱 | 时柱 |
|---|---|---|
| 22:58 | 甲辰 Jia Chen | 乙亥 Yi Hai |
| 23:00 | 乙巳 Yi Si | 丙子 Bing Zi |
This site defaults to sect=1 (the day rolls over); the other school (sect=0) gives day 甲辰 (Jia Chen) at the same moment. Both are documented on the methodology page; this page only pins the boundary to the minute.
The popular version pairs each two-hour block with a personality, as if two hours could settle a person. Structurally the hour pillar is a position: it carries a stem and a branch, two ten-god labels, two characters of five-element weight, and it supplies the moment the luck-cycle conversion needs. All of that can be checked item by item. "People born in the Zi hour are like this" cannot, and this page does not print it.
本页刻意不做的事：网上流传的通俗版本会给每个名目指派一套固定性格——一个地支一种人、一个阶段一种命。本站拒绝这种写法。这里发布的是一个结构位置：谁的五行坐在哪里、坐在什么样的地基上、地基里藏着什么。同一个名目在不同的月令之下读法不同；缺少盘中其余各字时，任何有意义的判断都不存在。凡传统给出读法之处，本页标注「此为传统读法」；本站自己的贡献是：页面上的每个数字与名目都由引擎实算、带版本号，可与方法论页逐条对账。
以下是本页独有的问题；更通用的口径问题见方法论页。
本站把八字里可穷举的构件都拆成了独立的页：每一页的事实都由同一个引擎实算，可逐条核对，不是人格对照表。