Earthly Branches: Order, Months, Hours, and Five Phases

What the Earthly Branches are

The twelve Earthly Branches form a repeating coordinate system used in traditional Chinese calendars and several related arts. In order, they are Zi, Chou, Yin, Mao, Chen, Si, Wu, Wei, Shen, You, Xu, and Hai. Paired in sequence with the ten Heavenly Stems, they produce the sixty stem-branch combinations used to label days and, in different contexts, years, months, and hours. The same branches also carry associations with seasons, directions, the Five Phases, zodiac animals, and hidden stems. That range explains why a branch cannot be reduced to its animal. The Rat is the familiar emblem of Zi, for example, but Zi is also a time coordinate and a Water-phase branch. Which layer matters depends on the method and question.

Calendar structure came before personality profiles

The stem-branch cycle belongs to early Chinese systems of calendrical recordkeeping and was established long before today's popular animal-sign personality profiles. The animal sequence became an enduring way to represent the branches in year naming, festivals, art, and everyday conversation, but it did not replace the underlying coordinates. Later calendrical, correlative, and divinatory traditions connected branches with months, double-hours, directions, seasons, and other symbolic categories. These layers should not be treated as if they all arose at one moment or carry identical authority. A dated calendar label is one kind of claim; a later interpretive association is another. Responsible study keeps historical record, conventional correspondence, and modern interpretation visibly separate.

The fixed order, polarity, phase, and animal

Zi: yang Water
Rat.
Chou: yin Earth
Ox.
Yin: yang Wood
Tiger.
Mao: yin Wood
Rabbit.
Chen: yang Earth
Dragon.
Si: yin Fire
Snake.
Wu: yang Fire
Horse.
Wei: yin Earth
Goat, with Sheep as a common translation variant.
Shen: yang Metal
Monkey.
You: yin Metal
Rooster.
Xu: yang Earth
Dog.
Hai: yin Water
Pig, with Boar used in some regional or editorial contexts.

These are conventional primary associations, not complete definitions. In this vocabulary, the Five Phases are Wood, Fire, Earth, Metal, and Water; the familiar phrase Five Elements is common in English, but phase better conveys processes and relationships rather than five chemical substances. Zi, Mao, Wu, and You are often grouped as central or cardinal seasonal positions. Yin, Si, Shen, and Hai appear in groupings translated as growth or travel branches, while Chen, Xu, Chou, and Wei are commonly discussed as transitional Earth or storage branches. Labels such as storage and travel describe structural functions. They do not rank a person or guarantee a life event. Each branch also contains one to three hidden Heavenly Stems in widely used Bazi tables, so saying that Chou is an Earth branch does not mean it contains only Earth-phase material.

Branch months use solar-term boundaries

Yin month begins at Beginning of Spring.
Mao month begins at Awakening of Insects.
Chen month begins at Clear and Bright.
Si month begins at Beginning of Summer.
Wu month begins at Grain in Ear.
Wei month begins at Minor Heat.
Shen month begins at Beginning of Autumn.
You month begins at White Dew.
Xu month begins at Cold Dew.
Hai month begins at Beginning of Winter.
Zi month begins at Major Snow.
Chou month begins at Minor Cold.

A branch month in Bazi is therefore not simply the numbered lunar month, and it does not begin automatically on the first day of a Gregorian month. The twenty-four solar terms divide the Sun's annual apparent path into equal longitude segments. Bazi month changes are conventionally keyed to the twelve sectional terms listed above, although English translations of individual term names vary by publisher. The exact transition occurs at a calculated moment, not at midnight everywhere. For a birth close to a boundary, use a reliable ephemeris or calendar calculation for that year, time, and location. Record the time zone and daylight-saving history as well. A chart should not be forced into a month branch merely because a printed date range looks convenient.

The twelve double-hours

Zi: about 23:00-01:00
Chou: 01:00-03:00
Yin: 03:00-05:00.
Mao: 05:00-07:00
Chen: 07:00-09:00
Si: 09:00-11:00.
Wu: 11:00-13:00
Wei: 13:00-15:00
Shen: 15:00-17:00.
You: 17:00-19:00
Xu: 19:00-21:00
Hai: 21:00-23:00.

This clock table is a useful modern reference for the traditional twelve-part day, but it does not settle every charting rule. Schools differ over whether the calendar day changes at the beginning of Zi hour, at civil midnight, or according to another declared convention. Practitioners also disagree about when to adjust civil time toward local solar time. The hour branch is only half of a Bazi hour pillar; its Heavenly Stem must be calculated from the day stem under the chosen day-boundary rule. For historical work, do not project modern standardized time zones backward without checking local timekeeping. For practical chart comparison, state the software, time standard, boundary convention, and any correction rather than hiding them behind an apparently precise result.

Seasons and directions form a northern-hemisphere framework

In the conventional seasonal scheme, Yin, Mao, and Chen belong to spring and the east; Si, Wu, and Wei to summer and the south; Shen, You, and Xu to autumn and the west; and Hai, Zi, and Chou to winter and the north. The four Earth branches sit near seasonal transitions and often receive closing, storing, or mediating interpretations. These correspondences developed in a Chinese northern-hemisphere calendrical setting. They remain part of the inherited symbolic system when a chart is cast elsewhere, but they should not be confused with a literal description of local weather in Sydney, Cape Town, or Buenos Aires. Traditional diagrams may also place south at the top, unlike the north-up convention familiar from modern maps. Always check the diagram's own orientation before reading position as direction.

A worked month-branch example

Suppose a recorded birth occurred in mid-March after the exact Awakening of Insects transition and before the exact Clear and Bright transition. Under the standard sectional-term method, the month branch is Mao. Mao is a yin Wood branch situated in the traditional spring sequence, and its primary hidden stem is Yi Wood. That gives the reader a seasonal coordinate; it does not by itself describe temperament, relationships, health, work, or future events. A Bazi analysis must still consider the month stem, Day Master, all four branches, hidden stems, roots, combinations, clashes, and the declared school method. If the birth occurred near the transition itself, accurate time and location could change the month assignment, so uncertainty should be resolved before interpretation begins.

How the branches function in different systems

In Bazi, branches help define the four pillars, seasonal context, hidden stems, roots, and branch relationships. One branch never replaces whole-chart analysis.
In Liu Yao, branches may be assigned to lines through a declared method and then evaluated with time factors, relationships, and the question's key significator. This is not the same procedure as reading a Bazi natal chart.
In Chinese zodiac practice, the animal commonly represents a year branch, but a birth near the annual boundary requires a stated calendar convention. A year animal is not a full Bazi chart.
In calendar study, branches label recurring coordinates. Their use as month or hour markers should be distinguished from later symbolic claims.
In branch-interaction analysis, combinations, clashes, punishments, harms, and breaks describe possible relationships. Their effect depends on position, season, support, transformation conditions, timing, and school.

Common mistakes to avoid

Do not equate an Earthly Branch with only its zodiac animal or infer compatibility and destiny from a birth-year animal.
Do not substitute a lunar-month number for a Bazi branch month
check the relevant solar-term transition.
Do not assume a branch's primary phase is its only content
hidden stems add internal structure.
Do not call every combination fortunate or every clash harmful. A relationship must be evaluated within the complete configuration.
Do not treat the two-hour clock table as a universal historical standard. State the time and day-boundary rules used.
Do not turn northern-hemisphere seasonal correspondences into unqualified claims about local climate elsewhere.
Do not mix Bazi, Liu Yao, Chinese zodiac, and general calendar usage simply because they share branch names.

Continue your study

For the sixty-pair cycle, continue with Heavenly Stems Guide (heavenly-stems-guide). For the internal contents of every branch, see Hidden Stems Guide (hidden-stems-guide). For exact seasonal transitions and calendar boundaries, read Solar Terms and the Chinese Calendar (solar-terms-and-calendar). For combinations, clashes, punishments, harms, and breaks, use Stem-Branch Relations (stem-branch-relations). Each target exists in the Mystic Atlas Article catalog, and each guide develops one part of the framework without replacing the others.