Geng Zi · 庚子
Geng Zi pairs 庚, a Yang Metal Day Master, with 子 (the Rat), a Water branch. Read the upper character first, then the branch and the stems it contains.
The Day Master on top
Yang Metal · 庚 — Geng (庚) is Yang Metal. Raw metal and a cutting tool are familiar images, used to express separation, form, and standards. These associations do not select a career or determine how assertive someone is.
Learn this Day Master's image and relationships →The branch and its hidden stems
子 (the Rat) contains 癸 in the traditional hidden-stem table. Each stem receives a ten-god label by comparing its element and polarity with 庚. The day branch is also traditionally called the spouse palace; that name does not identify a partner's character.
癸
Output (Sharp)
Yin Water · 癸 → 庚
Na Yin
Geng Zi has the Na Yin label 壁上土, "Plaster-Wall Earth". Thirty names are shared by the sixty pairs. This is a separate classification from the Day Master's element.
Stage of the cycle
Dormant · This is the traditional twelve-stage label for the day stem 庚 in branch 子. Read it as a stem–branch classification, not a person's age or state of health.
The two unpaired branches (Xun Kong)
庚子 belongs to the ten-pair group beginning with 甲午. Its ten stems pair with ten of the twelve branches, leaving 辰巳 outside that group. Those two are called Xun Kong, or "void branches".
Keep the Day Master, change the branch
These day pillars share the same upper character. Compare their hidden stems to see why a Day Master alone cannot describe all the chart relationships.
Is Geng Zi actually your day pillar?
Calculate all four pillars from your birth details, then check the day column. Near the day boundary, birth time and the calculator's time conventions can affect the result.
This reference describes one of four pillars. The calculator shows the full chart and the birth details used to produce it.