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Liqiu: The Start of Autumn and the Rise of Metal in BaZi

Deep Oracle 学术组 / Deep Oracle Practitioner Desk · 2026-05-16 · 8 min read

Liqiu: When Autumn Begins and Metal Ascends

Liqiu (立秋), the Start of Autumn, typically falls on August 7–9 each year in the Gregorian calendar. Unlike the popular notion of autumn as a gentle cooling, in the BaZi system Liqiu triggers a decisive shift: the fiery dominance of summer yields to the crisp, contractive energy of Metal. This solar term marks the exact moment when the sun reaches an ecliptic longitude of 135°, and day length in the Northern Hemisphere begins to shorten more noticeably, with nights growing longer. For agricultural societies, Liqiu signalled the harvest season approaching – a time of both ripening and restraint.

Astronomical Anchor: The Sun at 135° Ecliptic Longitude

At Liqiu, the sun's position along the ecliptic passes the 135° mark (measured from the vernal equinox). From this point, the direct solar radiation shifts southward, causing the angle of sunlight to decrease. This results in a gradual drop in temperature, though residual summer heat often lingers – a phenomenon known as "autumn tiger" (秋老虎) in many East Asian cultures. The day length continues to shorten, with the balance tipping towards longer nights, subtly influencing the yin-yang dynamics of the environment. In BaZi, such astronomical changes directly inform the energy of the month branch.

BaZi Calendar Role: Triggering the Shen Month Pillar

Liqiu is one of the 12 solar terms that initiate a new month branch (月支) in the Chinese calendar. It marks the beginning of the Shen (申) month – the ninth earthly branch, associated with Yang Metal. From the first day of Liqiu onward, the monthly pillar transitions from the Wei (Goat, Earth) of late summer to Shen (Monkey, Metal). This switch is non-negotiable in BaZi chart construction: the month pillar reflects the seasonal energy that shapes a person's character and destiny. As a boundary term, Liqiu ensures that anyone born after its exact onset (calculated astronomically) has Shen as their month branch, not Wei. The boundary effect is critical – even minutes matter for accurate chart casting.

The Month Branch Shen: Metal's Pure Yang Force

The month branch Shen (申) is the earthly form of Yang Metal (庚金). In the five-element cycle, Metal represents contraction, structure, discipline, and clarity. Shen's nature is often described as hard, sharp, and resolute, akin to weapons, gemstones, or finely crafted tools. Within the BaZi framework, Shen is also the reservoir of Water – it contains the heavenly stems Geng (庚, Yang Metal), Ren (壬, Yang Water), and Wu (戊, Yang Earth). This internal composition gives Shen a dual character: its primary identity is Metal, but it carries the seed of Water, which later becomes dominant in the following month of You (Rooster, Yin Metal). Thus, during Liqiu, the air begins to dry as Metal's contracting force reduces humidity, yet the hidden Water suggests an undercurrent of coolness preparing to emerge.

Classical Seasonal Associations: 《月令七十二候》 Phenology

The classical text 《月令七十二候》 (Monthly Orders and Seventy-Two Phenological Phases) divides Liqiu into three pentads (five-day periods):

凉风至 (Liáng fēng zhì) – "Cool winds arrive" – the first breath of autumn wind, signalling the retreat of summer's heat.
白露降 (Bái lù jiàng) – "White dew descends" – morning condensation increases, forming dewdrops that shimmer white in the early light.
寒蝉鸣 (Hán chán míng) – "Cold cicadas chirp" – the last cicada songs of the season, weaker and more melancholy than summer's chorus.

Agriculturally, Liqiu is the time for harvesting early rice, planting autumn vegetables, and preparing for the storage of grains. The phrase "立秋之日凉风至" (On the day of Liqiu, cool winds arrive) encapsulates the transition from growing to reaping. In traditional Chinese medicine, the season calls for nourishing the Lungs (Metal organ) and protecting against dryness – a principle that parallels BaZi's climate adjustment logic.

Those Born During Liqiu: Climate-of-Birth Logic

People born during the Liqiu period (approximately August 7–22) carry the Shen month branch. Their core earthly branch energy is Yang Metal – strong, principled, and sometimes blunt. However, the climate of birth is not merely the branch; it's the interplay of all four pillars. The character of a Liqiu-born person often reflects Metal's attributes: a sense of justice, a need for order, and a tendency to cut through confusion with direct logic. Yet, the hidden Water within Shen adds depth: these individuals may possess an inner reservoir of intuition or strategic thinking, especially if Water appears elsewhere in their chart. The residual heat from the preceding Wei month can make them outwardly warm but inwardly disciplined. This is not a pop-zodiac prediction – it's a pattern derived from the five-element climate (调候) of early autumn: the external environment begins to cool, but the internal yang of summer still simmers.

Climate Adjustment (调候) for Shen Month Charts

In classical BaZi texts such as 《穷通宝鉴》 (Qiong Tong Bao Jian), climate adjustment (调候) is essential for evaluating a chart's harmony. For a Shen month branch, the prevailing element is Metal, but the season is still early autumn – not yet the deep autumn of You month. The first priority is to assess whether the chart has sufficient Fire to warm the Metal. Without Fire, the Metal can become cold and rigid, leading to a personality overly harsh or withdrawn. Conversely, too much Fire can melt the Metal, causing indecision or burnout. Water also plays a key role: as the hidden resource of Shen, it can either nourish the Metal (if balanced) or drain it (if excessive). Earth is the mother of Metal and can provide stability, but too much Earth buries the Metal's sharpness. The ideal climate for a Shen month chart often calls for a moderate Fire element (especially from the heavenly stem Bing or Ding) to temper the Metal, along with controlled Water to keep the energy flowing. Charts lacking Fire may need the addition of summer elements, while those with excessive Water may require Earth or Wood to drain the Water's strength.

YMYL Note: The Liqiu solar term is a climate marker, not a destiny stamp. While the season's energy influences tendencies, each BaZi chart is a unique constellation of five elements. Use the seasonal clues as one thread in a larger tapestry – never a sole determinant.

Practical Applications in Chart Reading

When analyzing a chart with Shen as the month branch, consider the following:

If the day master is Metal (Geng or Xin): The month branch is the same element, giving strong self-base. Watch for competition from other Metal stems or branches – this can create conflict unless controlled by Fire.
If the day master is Wood (Jia or Yi): Shen's Metal can chop the Wood, indicating challenges in career or health. Water in the chart may soften the blow by transforming Metal into Water to nourish Wood.
If the day master is Water (Ren or Gui): Shen is a resource star – Water gains strength. But if the chart has too much Metal, Water may overflow, requiring Earth or Fire to regulate.
If the day master is Fire (Bing or Ding): Metal from Shen is the Wealth element – potentially favourable if Fire is strong enough to manage it. A weak Fire may be overwhelmed.
If the day master is Earth (Wu or Ji): Shen's Metal drains Earth's energy. Water in Shen can further weaken Earth. Strong Fire or Earth allies are needed for balance.

These are general guidelines – always consult the full chart with its heavenly stems and other branches for precise interpretation.

Liqiu and the Path of the Year

For those born in a Liqiu year (where the year pillar also contains Shen, e.g., 2028, 2040, etc.), the monthly Shen doubles the presence of Metal. This intensifies the traits but also increases the need for climate harmony. Such individuals may be exceptionally determined but also prone to stubbornness. Understanding Liqiu's role in the annual cycle helps practitioners anticipate seasonal trends – for example, during a Liqiu period, many people may feel a shift towards introspection, organization, or a desire to "harvest" the results of summer efforts.