The sexagenary cycle, also known as the gānzhī or stems-and-branches, is a fascinating method of timekeeping that has been used historically in China and other East Asian cultures. This cycle, consisting of sixty terms, has played a significant role in recording time, particularly in the context of years and days. Its origins and continued influence in various cultural practices make it a topic worth exploring.
Origins and Early Use
The sexagenary cycle first appeared as
a method for recording days in the earliest Chinese written texts, specifically on oracle bones from the late second millennium BC during the Shang dynasty. Almost every oracle bone inscription includes a date in this format, indicating its widespread use for divination and other purposes. This system continued to be prevalent throughout the Zhou dynasty and remained common into the Han period for all documentary purposes requiring specific dates.
The use of the sexagenary cycle for recording years, however, is a more recent development. The earliest documents showing this usage were discovered among the silk manuscripts from Mawangdui tomb 3, sealed in 168 BC. These documents marked notable events using the cycle, such as the first year of the reign of Qin Shi Huang in 246 BC. The cycle's use for recording years became widespread during the Western Han dynasty, and it has continued uninterrupted ever since.
Cultural Significance and Variations
The sexagenary cycle has been an integral part of traditional calendrical systems in Chinese-influenced Asian states and territories, including Japan, Korea, and Vietnam. Each term in the cycle consists of two Chinese characters: one of the ten Heavenly Stems and one of the twelve Earthly Branches. This combination reflects the yin and yang properties, which are central to many East Asian philosophies.
In Japan, the calendar was officially adopted in 604 AD, marking the first year of the cycle. The Korean and Japanese traditions of celebrating the 60th birthday, known as hwangap and kanreki respectively, reflect the influence of the sexagenary cycle as a count of years. The Tibetan calendar also uses a 60-year cycle, although it starts with a different animal and element combination.
Modern Relevance and Applications
While the sexagenary cycle no longer plays a significant role in modern Chinese timekeeping or the official calendar, it continues to be used in contemporary Chinese astrology and fortune-telling. The cycle is also referenced in the names of many historical events, such as the Chinese Xinhai Revolution and the Japanese Boshin War.
The cycle's combination of two sub-cycles to generate a larger cycle has parallels in other calendrical systems, such as the Akan calendar. Despite its ancient origins, the sexagenary cycle remains a relevant and intriguing aspect of East Asian cultural heritage, illustrating the enduring legacy of traditional timekeeping methods.
