The 10 Heavenly Stems (Tian Gan) are components of an ancient style of acupuncture known as chronoacupuncture.

This acupuncture method is based on the concept that qi moves through a predictable series of acupuncture points at different times of the day, week, month, and year.

Together with the 12 Earthly Branches (Di Zhi), the Heavenly Stems comprised the units for counting time in the traditional Chinese calendar, which used 60 year cycles.

The Heavenly Stems and Earthly Branches make up an essential part of Feng Shui calculations, Chinese astrology, and classical acupuncture,  The first known mention of the Heavenly Stems dates back to 2697 B.C. by Huang Di, the Yellow Emperor.

Lavender, Bamboo, and Flowers