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BaZi (Four Pillars of Destiny) · Day Master 8 of 10

Xīn 辛, yin Metal: frost, moonlight and soft, clear metal

Xīn 辛 is the eighth Heavenly Stem, yin Metal, and the day master of any BaZi chart whose day stem it is. The classical images make it frost in the sky, the essence of the moon and the ore in the mountain. The 滴天髓 calls it soft, warm and clear, and its older commentary says plainly that it is not jewels. As a day master it is rooted in 酉, 丑 and 戌.

The ten Heavenly Stems in a row from 甲 to 癸, paired by phase, with 辛 Xīn marked; below, the five phases on a circle, with arrows for the producing order and lines for the overcoming order, showing that Earth produces Metal, Metal produces Water, Metal overcomes Wood and Fire overcomes Metal. Wood 甲 Jiǎ 乙 Yǐ Fire 丙 Bǐng 丁 Dīng Earth 戊 Wù 己 Jǐ Metal 庚 Gēng 辛 Xīn Water 壬 Rén 癸 Guǐ 木 Wood 火 Fire 土 Earth 金 Metal 水 Water Xīn · Metal Produced by Earth Produces Water Overcomes Wood Overcome by Fire produces overcomes
辛 among the ten stems, and Metal in the two classical orders: produced by Earth, producing Water, overcoming Wood, overcome by Fire.

Facts

Order
8 of 10, the eighth Heavenly Stem
Character
辛 Xīn
Phase and polarity
Metal 金, yin 陰
Season of its phase
Autumn
Produced by; produces
Earth; Water
Overcomes; overcome by
Wood; Fire
Rooted in (hidden in)
丑 Chǒu (middle qi), 酉 Yǒu (main qi), 戌 Xū (residual qi)
Comes into office (祿)
酉
Blade (陽刃)
None: in the Ziping rule only the yang stems have one
Born in (長生)
子, running the stages backward
Combines with
丙 Bǐng, leaning to Water
Clashes with
乙 Yǐ
Our image
Fine jewellery (EsoTerrier's modern image)

Meaning

The 滴天髓 gives each stem a verse of eight short lines. For 辛 it reads, in the 輯要 text:

辛金軟弱,溫潤而清,畏土之疊,樂水之盈,能扶社稷,能救生靈,熱則喜母,寒則喜丁。

In our translation: Xīn metal is soft and weak, warm, moist and clear. It fears earth heaped upon it and delights in water in abundance. It can uphold the altars of the state and rescue living things. In heat it likes its mother; in cold it likes 丁.

The commentary explains the large claim of the third couplet through 辛's combination with 丙 (丙辛合): bound to it, 丙 no longer burns the 甲 wood, and so living things are saved. The mother is 己, the moist earth that produces it. The same older commentary, the 原注, printed in both the 輯要 and the 闡微, adds the line that matters for our naming: 「辛乃陰金,非珠玉之謂」, 辛 is yin metal and does not mean pearls and jade, only gentle, clear metal. 任鐵樵 calls it the substance of the five metals of the human world.

The 三命通會 makes 辛 the essence of the moon (太陰之精) and, on earth, metal: the ore in the mountain, which the water of 子 washes free of sand until it shines and the earth of 巳 buries. Its sky image is frost. The 窮通寶鑑 finds the 辛 of the first month out of its season: it takes 己 as its source and owes its lustre to 壬.

Our chart calls 辛 fine jewellery: refined, perceptive, aesthetic and precise, with vanity and a thin skin as its cost. It is the image of most English teaching and EsoTerrier's own on the chart, kept as a modern image, labelled as ours, with the classics' warning beside it; it is not the classical meaning.

In a chart

A 辛 day master has roots wherever 辛 is hidden in a branch: 丑 Chǒu (middle qi), 酉 Yǒu (main qi), 戌 Xū (residual qi). Its 祿, the branch where its qi comes into office (臨官), is 酉. In the Ziping rule only the yang stems have a blade, though the 三命通會 reports an older rule that gave 辛 one in 戌. It is born (長生) in 子 and, as a yin stem, runs the twelve stages backward from there, the rule every tool prints and the classics dispute; the stages are phases of its qi.

It combines with 丙 Bǐng (天干五合), a pair the 三命通會 calls 威制之合 (the match of authority and restraint), leaning to Water; it clashes with 乙 Yǐ. Its own phase is strongest in autumn.

To a 辛 day master the ten stems are: 甲 Direct Wealth (正財); 乙 Indirect Wealth (偏財); 丙 Direct Officer (正官); 丁 Seven Killings (七殺); 戊 Direct Resource (正印); 己 Indirect Resource (偏印); 庚 Rob Wealth (劫財); 辛 Friend (比肩); 壬 Hurting Officer (傷官); 癸 Eating God (食神). A second 辛 elsewhere in the chart is a Friend; the day stem itself is the Day Master and is not one of the Ten Gods.

What this page leaves out

The classical chapters on 辛 also say, in the idiom of their age, what such a chart means for rank, kin, marriage and fortune. We record that they do and repeat none of it. Nor do we say whether a 辛 day master is strong or weak, or which useful god it needs: the tradition weighs both, and EsoTerrier computes neither.

Correspondences

Each item with how it stands: “sourced” is in the work cited, “our construction” is EsoTerrier’s own, and “disputed” means the sources disagree.

Opening of the 滴天髓 verse
「辛金軟弱」 sourced
Sky image, 三命通會
Frost (霜) sourced
In heaven and on earth, 三命通會
In heaven the sun and moon, the essence of the moon; on earth metal, the ore in the mountain (在天為日月,乃太陰之精,在地為金) sourced
The first month, 窮通寶鑑
In the first month 辛 has lost its season to 甲; it takes 己 as its source and owes its lustre to 壬 (正月辛金) sourced
Combination, 三命通會
With 丙: 威制之合 (the match of authority and restraint) sourced
Nobleman star (天乙貴人)
寅 and 午; a symbolic star we do not chart yet sourced
Academic star (文昌)
子; a symbolic star we do not chart yet sourced
Blade under an older rule
戌, a rule the 三命通會 reports and the Ziping method drops disputed
Our image, traits and challenge
Fine jewellery: refined, perceptive, aesthetic and precise; its challenge: vanity, and thin skin our construction
Fine jewellery as the classical meaning
A modern image; the classics give the ones above, and the 原注 says 辛 is "not jewels" disputed
First meaning of the character
Uncertain; the stems are first attested as day names of the Shang week disputed

How the schools read it

滴天髓, the verse
Soft, warm, clear metal that fears heaped earth and loves water; through 丙 it saves the wood. Attributed to 京圖 of the Song or to Liu Bowen; one edition study dates the text mid-Ming or later.
任鐵樵, 滴天髓闡微 (after 1820)
The same verse; with the 原注 that 辛 is "not jewels", and 任鐵樵's own gloss, the metal of the human world.
三命通會 (Ming)
The moon's essence and the ore in the mountain; frost.
窮通寶鑑 (Qing)
Out of season in the first month, sourced in 己 and polished by 壬.
Modern English teaching
The one-word image, fine jewellery, a simplification of the classical images.
EsoTerrier
Shows fine jewellery as its own image, labelled, beside the texts.

Claims about it

  • 辛 is jewellery, gold and precious stones.

    disputed

    What the record shows: The 滴天髓's older commentary says 辛 is not jewels but gentle, clear metal; 任鐵樵 calls it the metal of the human world; the 三命通會 makes it the moon's essence and ore. Our chart keeps "fine jewellery" as a modern image, labelled as ours.

  • The day stem is itself a Ten God, the Friend (比肩).

    false

    What the record shows: A 辛 in another pillar is a Friend to a 辛 day master; the day stem itself is the reference point, labelled Day Master (日主) by every tool we surveyed.

  • 辛 runs the twelve stages backward, born (長生) in 子.

    disputed

    What the record shows: The 三命通會 says so and every tool prints it. The 滴天髓's older commentary already questions it, and 任鐵樵 rejects separate yin stages. We print the backward rule and label it.

  • A 辛 day master can be scored strong or weak, and its useful god computed.

    disputed

    What the record shows: The classics ground the useful god in at least four different ways. EsoTerrier computes neither the strength nor the useful god.

  • The classical chapters on 辛 tell a person's rank, marriage and length of life.

    told as lore

    What the record shows: The texts do make such pronouncements, in the idiom of their age. We take only their images and the logic of the phases.

Elsewhere on EsoTerrier

Sources

Primary texts (5)
  1. 淵海子平, the Ming compilation by 楊淙 of 徐大升's Song works. Chinese Wikisource transcription. zh.wikisource.org/wiki/淵海子平
  2. Wan Minying, 三命通會, 12 juan (Ming). Chinese Wikisource transcription. zh.wikisource.org/wiki/三命通會
  3. 滴天髓, the 滴天髓輯要 text with its older commentary. Chinese Wikisource. zh.wikisource.org/wiki/滴天髓
  4. 窮通寶鑑, the Qing edition by 余春台 of the 欄江網. Chinese Wikisource transcription. zh.wikisource.org/wiki/窮通寶鑑
  5. 任鐵樵, 滴天髓闡微 (after 1820), with the 原注. Chinese Wikisource transcription. zh.wikisource.org/wiki/滴天髓闡微
Studies and other sources (3)
  1. Na Hyeok-Jin and Kim Ki-Seung, "A Study on the Editions of Myeongri Original Text Jeokcheonsu (滴天髓)", Industry Promotion Research 6(3) (2021): 49 ff. doi.org/10.21186/IPR.2021.6.3.049
  2. Adam Smith, "The Chinese sexagenary cycle and the ritual foundations of the calendar", in John M. Steele (ed.), Calendars and Years II. Oxford: Oxbow, 2011 (read at abstract level).
  3. "Heavenly Stems", Wikipedia (orientation only). en.wikipedia.org/wiki/Heavenly_Stems
Our own research (4)
  1. EsoTerrier, BaZi and Luck Pillars research: conventions, naming and the tools surveyed, 9 to 13 October 2026.
  2. EsoTerrier, the BaZi data tables with their sources: hidden stems, Ten Gods, Na Yin, twelve stages, void branches, relations and symbolic stars.
  3. EsoTerrier calculation engine, the BaZi and Luck Pillars services and their documentation.
  4. EsoTerrier, the owner's decisions of 13 October 2026 on how the day-master pages show the images.

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By EsoTerrier. Written with AI assistance from our research and checked against its sources; last revised 19 October 2026. How we write these pages.

First published ; last revised . Corrections: support@esoterrier.com.

Chinese quotations are from public-domain texts as transcribed on Chinese Wikisource (CC BY-SA 4.0); the translations and readings are EsoTerrier's own.