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Earthly Branch · Water

Hai (亥) Earthly Branch in Bazi

Hai (亥) is branch 12 of 12, classified as Yin Water. Learn its month, double-hour, hidden stems, harmony, clash, trine, and reading limits.

Chinese
亥
Pinyin
Hài
Also known as
Hai · Hai Water · Pig Branch · Yin Water Branch

Editorially reviewed:

Overview

Hai (亥) is the Yin Water branch associated with early winter. It is a calendrical and structural chart symbol, not a stand-alone zodiac personality label.

At a glance

Character and reading
亥 · Hài
Sequence position
12 of 12
Yin-Yang and phase
Yin Water
Zodiac animal
Pig
Solar month and season
10th solar month · begins near Start of Winter · Early winter
Conventional double-hour
21:00–22:59
Hidden stems
壬 Water · 甲 Wood
Core relations
Harmony: Yin (寅) · Clash: Si (巳) · Wood trine with Mao (卯) and Wei (未)

Definition and place in the cycle

Hai is twelfth in the cycle, closing the sequence before it returns to Zi.

Hai (亥) is classified as a Yin Water Earthly Branch. Its animal is a calendrical mnemonic; neither the animal nor the phase alone establishes personality, strength, or outcome.

Season, solar month, and double-hour

Hai (亥) governs the 10th solar month · begins near start of winter and is associated with early winter. The listed civil-clock double-hour is 21:00–22:59.

Hai begins the winter Water group while preserving a Wood seed in its conventional internal structure. Solar-term boundaries and the time standard used for a chart can shift the practical calendar or hour boundary, so calculate the chart rather than guessing from a date or wall clock alone.

Hidden stems and chart role

Hai (亥) conventionally contains 壬 Water, 甲 Wood. Hidden stems describe internal elemental layers and possible roots; this page does not assign fixed weights because schools and calculation methods differ.

Ren and Jia are conventionally hidden in Hai, so Water depth and Wood support must be read through season, roots, and active relationships.

Branch relations and reliable reading boundary

Hai (亥) forms a Six Harmony pair with Yin (寅), a Six Clash axis with Si (巳), and a Wood trine group with Mao (卯) and Wei (未). A listed relation is a structural possibility, not proof of a favorable, harmful, or transformed result.

  • Read month command, pillar position, hidden stems, visible stems, support, control, and timing together.
  • Do not reduce an Earthly Branch to its zodiac animal or one personality adjective.
  • Do not assume that a harmony, clash, or trine automatically activates or decides the whole chart.

Sources and editorial basis

  1. Hong Kong Observatory: Heavenly Stems and Earthly Branches
    An official modern reference for the canonical stem and branch orders, the sexagenary cycle, and calendrical use.
  2. 《御定星曆考原》卷一
    A historical source for stem and branch Yin-Yang, Five Phase, direction, seasonal, and calendrical correspondences.
  3. 《淵海子平》 (Yuanhai Ziping)
    A foundational Ziping reference for branch months, hidden stems, roots, and stem-branch relationships.
  4. 《子平真詮》 (True Explanations of Ziping)
    A major reference for month-command, structure, and contextual Bazi interpretation.
  5. OpenFate Editorial Methodology
    OpenFate separates deterministic chart calculation, traditional interpretation, and modern editorial explanation.
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