Formula · Fixed classical rule
A year reduced modulo 10 and modulo 12 gives the two phases that make up its stem-branch pair. Both were zero in 1984, which is why that year was the first pair of the cycle.
Anchored at 4 CE; the year turns at the start of spring
Fixed classical rule
This one is a fixed classical rule: executed from traditional tables, not adjusted to taste.
Related: calendar and the day boundary · all formulas · tools
Where is this formula used?
It is the same entry listed on the method page, used in pages such as calendar and the day boundary; the link above shows it in context.
Did you invent this formula?
This one is a fixed classical rule: executed from traditional tables, not adjusted to taste.