冬至 Winter Solstice: winter solar term, December 21-23 冬至 · Dōng Zhì

Classical attributes

• Solar position: longitude 270°
• Date range: December 21-23
• Season: winter (middle winter)
• Type: 氣 — Mid-term — within month
• Month branch: 子 (Rat)

Climatic register

Shortest day; longest night; yin energy at maximum. From this point onward, yang begins its return — the first stirring of the next solar cycle. Traditionally the date when Yang Dun begins in the Qi Men Dun Jia system.

Hidden stems of the 子 month branch

The 子 earthly branch holds these heavenly stems internally — read in BaZi as the “hidden essence” of the month pillar:

• 癸 (Yin Water, sole)

BaZi relevance

冬至 is the mid-term within the 子 month pillar — the inflection point where yin energy peaks and yang begins its return. For BaZi practice, charts cast around 冬至 carry the maximum water-strength of the year, but practitioners also note the immediate yang-return: the period after 冬至 is when fire energy begins re-emerging in the chart's longer-cycle reading.

QMDJ (Qi Men Dun Jia) relevance

Yang Dun begins at 冬至 (Winter Solstice). The Winter Solstice is the foundational pivot of the QMDJ year — yin energy reaches its maximum and yang begins its return. In the QMDJ system, 冬至 falls within the 陽遁 (yang dun, forward-rotating expansion) half-year. The three thirds of this solar term map to 陽遁1局 (upper), 陽遁7局 (middle), and 陽遁4局 (lower) respectively. QMDJ consultations made during 冬至 carry the dun-period register stacked on top of the solar-term's seasonal energy.

For chart-aware QMDJ reading of a specific consultation made during 冬至, see the 18 Dun Periods reference for the relevant dun-period pages, or book a QMDJ forecasting consultation.

Observed register for 冬至 births

冬至 carries the register of the deepest stillness from which the new cycle begins. Born around 冬至 often carries a register of profound resilience and the instinct for renewal at moments of maximum challenge — the classical 'yang within yin' character.

Why generic Winter Solstice interpretation fails

The solar term is one structural layer of a BaZi chart, not the whole chart. The actual reading for someone born around 冬至 depends on the day pillar (the Day Master), the year and hour pillars, the chart's elemental balance, and the upcoming luck pillars. Generic per-solar-term descriptions can name the foundational seasonal register, but they cannot tell you what your specific chart says. Master Sean Chan’s BaZi consultation reads the full chart against your specific question.

• Identify whether your birth or your question's timing falls within 冬至 (December 21-23). For BaZi practice, this mid-term sits within the 子 month pillar without changing it.
• Read the 冬至 register against your full chart. The solar term contributes a foundational layer; the rest of the chart determines actionable guidance.
• Plot your chart via the free BaZi Calculator to see how 冬至 interacts with your day, year, and hour pillars.
• Book chart-aware reading via BaZi consultation for high-stakes questions. Generic per-term reference is no substitute for the consultation.