三合

sān hé

Threefold conjunction · san he

Also rendered: Threefold conjunction (this site; 合 is a fitting together, and the chapter is counting how many things fit) · The threefold agreement (plainer; the same sense, and it loses 合, which is a closing and not a consensus)

Reviewed · 2026-10-05

At a glance

Pinyin
sān hé
Simplified
三合
Literal
三 sān — three; 合 hé — to close, to fit together (《說文》: 合,合口也). A threefold conjunction is the year in which all three agree: the circuit answers to heaven, bears upon the year, and the two are one. One occurrence, at the end of 應天爲天符,承歲爲歲直,三合爲治 — three names in eleven graphs, and not another word spent on any of them. What the chapter does say is what the third is for: 爲治, there is governance.
Shuowen
**「三」讀 sān,本篇10見**;**「合」讀 hé,本篇4見:「三合爲治」「五六相合」「合之柰何」「柰何合之」**;**《說文》:合,合口也,从亼从口**;**「天符」本篇1見,「歲直」本篇1見,與「三合」同在一句**;**「爲治」本篇1見**

In brief

The third and fullest of the chapter’s three agreements, and the only one with a consequence attached: 三合爲治, when three things fit, there is governance. The three are the two already named plus their coincidence — a year that is both 應天 and 承歲 at once. Later writing on the doctrine gives that year its own name, 太乙天符, and sets out what follows from it; here it is the climax of a sentence whose whole purpose is 氣可與期 — that the qi of a year can be met on time, because the agreements that govern it can be counted.

Senses in the classical corpus

1
The graphs 三合
三者天符、歲直與其相兼者;合者合口也
三合爲治 — Suwen 66
2
What it is the third of 應天爲天符,承歲爲歲直
三事並舉,三合居其末
應天爲天符,承歲爲歲直,三合爲治。 — Suwen 66
3
What follows from it 爲治
三者合,則其歲可治
三合爲治。 — Suwen 66
4
What all three are for 氣可與期
知迎知隨,則氣可與期
知迎知隨,氣可與期。 — Suwen 66
5
Its two predecessors 天符、歲直
一應天,一承歲,三合則兼之
承歲爲歲直 — Suwen 66
6
The name used later 太乙天符
後世運氣家以此為太乙天符
三合爲治。 — Suwen 66

Occurrences in the classics

Passages where the term does real work, with the original, pinyin and English on the same line.

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1 passages
Suwen 66 Suwen 66 · 天元紀大論 Read in context →
鬼臾區曰:陰陽之氣,各有多少,故曰三陰,三陽也。形有盛衰,謂五行之治,各有太過不及也。故其始也,有餘而往,不足隨之;不足而往,有餘從之。知迎知隨,氣可與期。應天爲天符,承歲爲歲直,三合爲治。 鬼臾区曰:阴阳之气,各有多少,故曰三阴,三阳也。形有盛衰,谓五行之治,各有太过不及也。故其始也,有余而往,不足随之;不足而往,有余从之。知迎知随,气可与期。应天为天符,承岁为岁直,三合为治。
Guǐ yú qū yuē: yīn yáng zhī qì, gè yǒu duō shǎo, gù yuē sān yīn, sān yáng yě. Xíng yǒu shèng shuāi, wèi wǔ xíng zhī zhì, gè yǒu tài guò bù jí yě. Gù qí shǐ yě, yǒu yú ér wǎng, bù zú suí zhī; bù zú ér wǎng, yǒu yú cóng zhī. Zhī yíng zhī suí, qì kě yǔ qī. Yìng tiān wéi tiān fú, chéng suì wéi suì zhí, sān hé wéi zhì.
Gui Yu Qu said: the qi of yin and yang each has its greater and lesser measure, and this is why one speaks of the three yin and the three yang. Form has its flourishing and decline: this means that in the government of the five phases there is in every case excess and deficit. Thus at its beginning, when there is surplus and it moves on, insufficiency follows; when there is insufficiency and it moves on, surplus follows after. Know what is to be met and what is to be followed, and the qi can be anticipated. Answering to heaven is the heaven tally; receiving the year is the year’s directness; the three in conjunction is government.
**「三合」本篇1見,在第十三段之末,為三事之三**;**「合」讀 hé,本篇4見:「三合爲治」「五六相合」「合之柰何」「柰何合之」**;**「三」讀 sān,本篇10見;「爲治」本篇1見**;**「天符」讀 tiān fú,本篇1見;「歲直」讀 suì zhí,本篇1見,三事同在一句**;**三事者,應天、承歲與二者之兼;兼之則三合,三合則其歲可治**;**後世運氣家謂之太乙天符**

Compounds built on this term

天符
tiān fú
heaven tally
本篇1見;三合所兼之一
歲直
suì zhí
year directness
本篇1見;三合所兼之一
五運
wǔ yùn
the five circuits
本篇4見;三合以歲運之氣言
太過不及
tài guò bù jí
excess and deficit
本篇1見;本篇三事即承其下而言

How it has been translated

Every rendering below is a decision about which reader is being addressed. There is no neutral option.

This sitethreefold conjunctionliteral from 合, to close or fit; kept because the chapter's sentence is arithmetic — one fit, another fit, three fits — and the climax is the count
Later usagesan he, the threefold combinationhow the phrase appears in English accounts of the doctrine; faithful, and usually glossed rather than translated
Technicala year in which the circuit, the presiding qi and the year's branch all agreewhat it comes to; correct, and it is a sentence rather than a term

Entry status

Review pending — who reviews this?

2026-10-05

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