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| Heavenly Stems | |
|---|---|
| Name | Heavenly Stems |
| Alt | Ten Celestial Stems |
| Caption | Traditional Chinese calendar symbols |
| Origin | Ancient China |
| Type | Cyclical ordinal system |
| Time period | Zhou dynasty onward |
Heavenly Stems are a traditional ten-part cyclical ordination used in East Asian calendrical and symbolic systems. They interrelate with the Sexagenary cycle, Earthly Branches, Chinese calendar, Traditional Chinese medicine and myriad historical records from dynasties such as the Zhou dynasty, Han dynasty, Tang dynasty and Song dynasty. Employed across regions including China, Japan, Korea and Vietnam, they underpin dating schemes found in texts tied to the I Ching, Shiji, Book of Han, Zuo zhuan and Classic of Poetry.
The stems comprise a ten-term sequence historically paired with the twelve-term Earthly Branches to form the sixty-term Sexagenary cycle used for recording years, months, days and hours in chronicles like the Spring and Autumn Annals and annals of the Han dynasty. Classical commentaries in the Confucian corpus and exegetical traditions associated with figures such as Sima Qian, Zuo Qiuming and later scholars in the Song dynasty codified their calendrical and ritual functions. Adoption spread to the Nara period in Japan, the Goryeo and Joseon courts in Korea, and the Lê dynasty and Nguyễn dynasty in Vietnam through diplomatic, religious and scholarly exchange.
Early Chinese bronze inscriptions from the Shang dynasty and Zhou dynasty indicate prototypical ordinal systems that evolved into the stems used by the Warring States period states. Han-era astronomers and chronologists such as those contributing to the Taichu calendar system integrated stems with sexagenary reckoning; imperial bureaus like the Astronomical Bureau (Han) and later the Bureau of Astrology (Tang) institutionalized their use. Contacts during the Silk Road era linked calendrical knowledge to Central Asian courts and to monastic chronicles in Nara and Balhae, while textual transmission via scholars tied to the Daoist and Buddhist traditions influenced ritual calendars in the Yuan dynasty and Ming dynasty.
The ten stems are conventionally associated with directional, elemental and yin–yang correspondences used in temple liturgy and official registers compiled under Emperor Wu of Han and later codices produced in the Song dynasty bureaucracy. They pair with the twelve Earthly Branches—the animals of the Chinese zodiac recorded in the Kaiyuan Zhanjing and encyclopedic works—to yield sixty composite designations found in inscriptions commissioned by rulers such as Qin Shi Huang and enumerated in annals like the Book of Han. Scholastic traditions represented by commentators such as Zhu Xi and Wang Bi elaborated metaphysical associations linking stems to the Five Phases and calendrical praxis in treatises copied at institutions like the Imperial Academy (Tang).
State calendrics from the Han dynasty through the Qing dynasty relied on stem-branch pairing to fix regnal years, ceremonial dates and agricultural timetables recorded in imperial edicts issued by courts in Chang'an, Luoyang and Beijing. Monastic registers in Tōdai-ji and Hōryū-ji used the system in Japanese temple chronicles, while royal annals of Korea such as the Annals of the Joseon Dynasty and Vietnamese dynastic histories like the Đại Việt sử ký toàn thư preserved sexagenary dating. European sinologists including Jean-Baptiste Du Halde, Joseph Needham and later historians working at institutions like the British Museum helped transmit knowledge of stems into Western calendrical studies.
Astrological treatises and divinatory manuals from the Han dynasty onward integrate the stems into prognostication methods used by diviners in the courts of Emperor Gaozu of Han, ritual specialists in the Tang dynasty imperial palace, and itinerant geomancers associated with figures such as Liu Bowen. Systems like Four Pillars of Destiny (BaZi) calculate natal charts by combining stems and branches; practices recorded in compilations attributed to authors in the Ming dynasty and preserved by practitioners in Fujian and Guangdong connect stems to temporal auspices, geomantic orientation, and talismanic formulas used in rites at temples like Longhua Temple.
The stems continue to appear in modern East Asian media, legal documents and cultural commemorations: newspapers and government gazettes sometimes reference sexagenary years when marking anniversaries of events such as the Xinhai Revolution or the founding of the People's Republic of China. Japanese nengō practices and Korean era-name historiography occasionally intersect with stem-branch dating in museum catalogs at institutions like the National Museum of China and Tokyo National Museum. Contemporary scholars in departments at Peking University, Kyoto University, Seoul National University and Vietnam National University study stems within broader research on calendrical science, philology and ritual history; enthusiasts of Chinese astrology and practitioners of traditional calendrical crafts preserve stem-based lore in festivals observed at sites such as Temple of Heaven and Meiji Shrine.
Category:Chinese calendar systems