固定与可变
这个问题通常藏着后半句：如果能改，要花多少钱。本页用算式回答前半句，后半句不接。
The example chart is 1985-07-04 12:00, male: 乙丑 Yi Chou · 壬午 Ren Wu · 甲辰 Jia Chen · 庚午 Geng Wu. Those eight characters are fixed by the birth moment; nothing that happens afterwards edits them:
| 构件 | 由什么决定 | 能改吗 |
|---|---|---|
| 年柱 + 月柱 | 出生日期落在哪个节气之后 | 否 |
| 日柱 | 连续日计数（23:00 换日） | 否 |
| 时柱 | 出生时段 | 否 |
| 日主（命主） | 日柱天干 | 否 |
Above the four pillars sits a second time structure; this site computes 10 steps of it. The example chart runs Backward (ni pai) (yin-stem year (乙) + male → sequence runs backward), starting at 9y 5m 20d:
| 步 | 干支 | 干（十神） | 支（十神） | 年龄段 | 年份 |
|---|---|---|---|---|---|
| 1 | 辛巳 Xin Si | 辛 Xin 正官 | 巳 Si, Snake 食神 | 10–19 | 1994–2003 |
| 2 | 庚辰 Geng Chen | 庚 Geng 七杀 | 辰 Chen, Dragon 偏财 | 20–29 | 2004–2013 |
| 3 | 己卯 Ji Mao | 己 Ji 正财 | 卯 Mao, Rabbit 劫财 | 30–39 | 2014–2023 |
| 4 | 戊寅 Wu Yin | 戊 Wu 偏财 | 寅 Yin, Tiger 比肩 | 40–49 | 2024–2033 |
| 5 | 丁丑 Ding Chou | 丁 Ding 伤官 | 丑 Chou, Ox 正财 | 50–59 | 2034–2043 |
| 6 | 丙子 Bing Zi | 丙 Bing 食神 | 子 Zi, Rat 正印 | 60–69 | 2044–2053 |
| 7 | 乙亥 Yi Hai | 乙 Yi 劫财 | 亥 Hai, Pig 偏印 | 70–79 | 2054–2063 |
| 8 | 甲戌 Jia Xu | 甲 Jia 比肩 | 戌 Xu, Dog 偏财 | 80–89 | 2064–2073 |
| 9 | 癸酉 Gui You | 癸 Gui 正印 | 酉 You, Rooster 正官 | 90–99 | 2074–2083 |
| 10 | 壬申 Ren Shen | 壬 Ren 偏印 | 申 Shen, Monkey 七杀 | 100–109 | 2084–2093 |
This layer is the part that moves — and it is not optional either. The direction is fixed by the year stem's polarity and the gender, and the annual pillar by the calendar year. What changes is which step you are standing in, not which one you may pick.
The classical literature does contain claims that fate can be changed, roughly of two kinds: that accumulated good conduct changes circumstances, and that dwelling environment and names can adjust them. Neither can be checked by this engine — they produce no recomputable number. This site labels them as traditional readings, neither endorsing nor mocking them. The only thing this page can do is separate fixed from moving: the pillars are fixed; where you stand on the timeline is not.
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。