Lunar months, solar terms, 60-year cycles — the Chinese calendar is far more sophisticated than most people realize. Here's a clear explanation.
The Chinese calendar is often called the "lunar calendar," but it's actually a lunisolar calendar — meaning it tracks both the moon's cycles AND the sun's position. This is how it stays aligned with the seasons despite being based on lunar months.
A pure lunar year is about 354 days — 11 days shorter than the solar year. If uncorrected, festivals would drift through all four seasons over decades. The Chinese solution: add a leap month (闰月) every two to three years to resynchronize. This is why Chinese New Year falls on a different Western date each year (between January 21 and February 20), but always begins near the second new moon after the winter solstice.
The solar year is divided into 24 equal segments of approximately 15 days each. These solar terms (节气 jiéqì) were created by ancient Chinese farmers to track planting and harvesting seasons precisely — independent of the lunar month system.
In BaZi (the Four Pillars of Destiny), the month pillar changes at each major solar term, not at the new moon. This is why BaZi practitioners use the solar calendar for calculations, even though the cultural calendar is lunar.
UNESCO added the 24 Solar Terms to the Intangible Cultural Heritage list in 2016, recognizing them as a remarkable achievement in observational astronomy and agricultural science.
The Chinese calendar uses a 60-year cycle (甲子 cycle) formed by combining the 10 Heavenly Stems (天干) with the 12 Earthly Branches (地支). Since 10 and 12 share a common factor of 2, the unique pairs cycle through 60 combinations before repeating.
| Heavenly Stems (10) | Earthly Branches (12 = 12 Zodiac Animals) |
|---|---|
| 甲乙丙丁戊己庚辛壬癸 | 子丑寅卯辰巳午未申酉戌亥 |
| Wood(+), Wood(-), Fire(+), Fire(-), Earth(+), Earth(-), Metal(+), Metal(-), Water(+), Water(-) | Rat, Ox, Tiger, Rabbit, Dragon, Snake, Horse, Goat, Monkey, Rooster, Dog, Pig |
This is why 60 years old is called a "full life cycle" in Chinese culture — you have experienced every unique year combination. 2026 is 丙午 (Bǐng Wǔ) — Yang Fire Horse, a year of powerful and fast-moving energy.
In BaZi, the year pillar changes at Lichun (立春, Start of Spring) — usually February 3–5 — not at Chinese New Year. This surprises many people. If you were born in January or early February, your BaZi year pillar is the previous year's.
Similarly, the month pillar changes at each major solar term. Hour pillars are divided into 12 two-hour segments (子时 Rat Hour = 11pm–1am, and so on). This precision is why BaZi requires exact birth data — even being born an hour earlier or later can change the hour pillar entirely.
Check today's lunar date, solar term, auspicious activities, and daily fortune — updated in real time.