How It Works
Each month follows the moon: it begins on the new moon, called 初一 (chūyī, "first day"), and the full moon falls around the 15th, 十五 (shíwǔ). A lunar month is about 29 or 30 days, so twelve of them total roughly 354 days—about eleven short of a solar year.
To stop the calendar from drifting away from the seasons, an extra leap month (闰月, rùnyuè) is inserted roughly every three years. This sun-correction is why "lunar calendar" is a slight misnomer: the months are lunar, but the year stays locked to the sun, making it truly lunisolar.
Origins & History
The Chinese calendar is one of the world's oldest, with roots stretching back over three thousand years to oracle-bone records of the Shang dynasty. Across the centuries, imperial astronomers continually refined it, since setting the calendar was considered a sacred duty of the emperor himself.
Its name, 农历, literally means "agricultural calendar," reflecting its original purpose: telling farmers when to plant and harvest. Even after 1912, when China adopted the Gregorian calendar for civil use, the 农历 endured as the heartbeat of cultural and family life.
In Chinese Life Today
Nearly every traditional festival rides on the 农历. Spring Festival, 春节 (chūnjié), opens the lunar new year; the Dragon Boat Festival, 端午 (duānwǔ), falls on the 5th day of the 5th lunar month; and the Mid-Autumn Festival, 中秋 (zhōngqiū), lands on the 15th, beneath the year's brightest full moon.
Beyond festivals, many families track lunar birthdays, choose auspicious wedding dates, and honor ancestors by the old calendar. Printed and digital calendars in China almost always show the 农历 date beneath the Gregorian one, keeping both rhythms within easy reach.
Why It Matters for Learners
Understanding the 农历 unlocks the meaning behind China's most beloved holidays and explains why 春节 lands on a different Gregorian date each year. Once you see that festivals follow the moon, the entire cultural calendar—and much of the vocabulary tied to it—suddenly makes sense.
The Twelve Lunar Months
Click any month for its festivals and moon lore. Today is 七月十三 — the red-ringed slice.