Yin Water 癸

The rain. In Korean, 계수 gyesu, the same Yin Water. The day master that reads a room before anyone has said anything worth reading.

Element 水 Water · Polarity Yin

What Yin Water is

Your day master is the single character your whole chart is measured against. Yin Water is the tenth and last of the ten heavenly stems, and the classical image is rain, dew or mist: water that arrives everywhere without force and gets into places nothing larger reaches.

Here is the part a trait list will not tell you. Yin Water picks up information it did not ask for. It reads the temperature of a room, the thing not said, the shift in someone’s tone, and it does this whether or not the reading is useful or wanted. Perception that cannot be switched off is a workload. The skill is treating what you notice as data to act on selectively rather than as an obligation.

How it reads in context

A day master on its own is one character out of eight. What changes the reading is the season it was born into, what else is sitting in the chart, and which decade the luck cycle has reached. Yin Water in a supported chart and Yin Water in a chart that fights it behave differently enough that the same advice would be wrong for one of them.

Table 01 · Yin Water against the other stems 9 relations

Stem Ten god Everyday role

Yang Wood 甲 Performer 伤官 Output that wants an audience

Yin Wood 乙 Output 食神 Output you enjoy making

Yang Fire 丙 Steady Wealth 正财 Return that arrives on a schedule

Yin Fire 丁 Open Wealth 偏财 Opportunity you have to go and get

Yang Earth 戊 Officer 正官 Structure you answer to

Yin Earth 己 Pressure 七杀 Pressure that sharpens or overwhelms

Yang Metal 庚 Support 正印 Support you can count on

Yin Metal 辛 Insight 偏印 Support that arrives unasked

Yang Water 壬 Rival 劫财 Someone after the same thing by a different route

Common questions

Notes

Is Yin Water the weakest day master?

No. It is the least forceful image, which is a different claim. Rain reaches ground no river gets to, and strength in a chart is read from the season, the roots and the company, never from how dramatic the stem's image is.

Why is Yin Water associated with intuition?

Because the classical image is water that penetrates everywhere, which the texts read as perception. What a document can honestly say is where that perception is likely to be an advantage and where it becomes a load, not that it is a special faculty.

Have your Yin Water chart read

Draw your four pillars free →

This page describes Yin Water in general. A reading takes your own chart: which season your Yin Water landed in, what stands beside it, and which decade you are in now.

BaZi Reading 八字 The four pillars read in full, with the ten gods translated into everyday roles and the luck pillars drawn as a timeline. Read the page → Korean Saju Reading 사주팔자 Your ilgan 일간, the element balance holding it up, your daeun 대운 cycles, and the sinsal worth knowing about. Every hanja translated where it sits. Read the page → Chart Legend A single sheet that decodes any BaZi chart: the stems, the branches, the five elements and the ten gods, each translated once and properly. Made to sit beside a reading. Read the page →

Still working out which system answers your question? Start with what a day master is

Method and sources

The ten god relations on this page are computed from the stems themselves, and their plain-English names follow the classical texts listed below. Day pillars are computed with a deterministic astronomical library, never estimated.

Read against the classical commentaries on stem strength and chart structure:

滴天髓 Ditian Sui Drops of Heavenly Marrow
子平真詮 Ziping Zhenquan The True Interpretation of Ziping
淵海子平 Yuanhai Ziping The Deep Sea of Ziping
三命通會 Sanming Tonghui A Comprehensive Treatise on the Three Fates
窮通寶鑑 Qiongtong Baojian The Precious Mirror of Seasons