The 农历 is the foundational framework for nearly all traditional Chinese holidays. Without it, the dates for Spring Festival (Chinese New Year), the Lantern Festival, the Dragon Boat Festival, and the Mid-Autumn Festival would be lost. These events are not just holidays but are deeply tied to family reunions, ancestor worship, and specific foods and rituals that are timed according to the 农历.
Comparison to the Western Calendar: The standard Gregorian calendar is a purely solar calendar; it tracks the Earth's 365.25-day journey around the sun. Its primary goal is to keep the seasons consistent (e.g., June is always summer in the Northern Hemisphere). The 农历, however, is a lunisolar calendar. It tracks the moon's phases to define its months (the first of the month is the new moon, the 15th is the full moon), but it also tracks the sun to define its years. To prevent the calendar from drifting out of sync with the seasons (a problem with purely lunar calendars), it adds an extra “leap month” (闰月 rùnyuè) every two or three years. This makes it a brilliant and complex system that harmonizes both celestial bodies.
Related Values: The 农历 reflects the core Chinese philosophical value of harmony between humanity and nature (天人合一 tiān rén hé yī). Its structure is based on observing and aligning human activities—from farming to festivals—with the natural cycles of the sun, moon, and seasons. This cyclical view of time is a cornerstone of Chinese culture.