Sexagenary‑Cycle year‑naming system

Sexagenary‑Cycle year‑naming system, which is the primary year‑dating method of the lunar calendar , includes Ten Heavenly Stems and Twelve Earthly Branches.

There are Ten Heavenly Stems

the Twelve Earthly Branches

Converting Gregorian calendar year to lunar calendar year

first, calculating the Heavenly Stems: (GregorianYear -3)%10, geting heavenly-stem-value,

secondly, calculating the Earthly Branches: (GregorianYear -3)%12, geting earthly-branch-value,

then, combin heavenly-stem-value and earthly-branch-value, geting Sexagenary‑Cycle year.

example: gregorian year 2026 converts to lunar year BingWu(Year of Horse).

first, calculating the Heavenly Stems: (2026-3)%10=3

secondly, calculating the Earthly Branches: (2026-3)%12=7

2 → Bing(丙), 7 → Wu(午)， and earthly branch Wu is year of horse.

then, combin heavenly-stem-value and earthly-branch-value: BingWu

so, 2026 is BingWu Year, Year of Horse.

Attention: The replacement of stems and branches is divided by the number of strokes at the beginning of spring; After the beginning of spring in 2026, it officially enters the year of Bingwu, and the Lunar New Year is just a folk New Year node.

The direct conversion here is convenient for everyone to understand.