Eastern calendar is based on two cycles:|
Together, these cycles form a 60-year stem-branch cycle.
Two cyclic characters in combination with two (sometimes more) characters of the Reign Title indicate the exact date.
- the cycle of ten Heavenly Stems, associated with Yin/Yang and Five Elements,
- the cycle of twelve Earthly Branches, associated with twelve animals of Asian Zodiac.
Example - how to date the silver bar: