ziwei-chart

What it produces

The palaces, the major and support stars, the birth-year transformations and the decade windows, written as checkable JSON and a data-only Markdown rendering.

Sex has to be stated

Whether the decades run forward or backward is decided by the year stem's polarity together with sex; neither alone settles it. The skill never infers it from a name or a form of address — a wrong guess reverses the whole decade sequence while the chart still looks entirely normal.

A late Zi hour produces a second chart

A birth in the late Zi hour also produces an alternative chart on the 00:00 day boundary. When the lunar day changes, Zi Wei and every star anchored to it move, so this is not a small difference within one chart but two different charts. Which one applies is a question traditions disagree on, so you get both.

What it does not do

It does not interpret — that is ziwei-reading. No BaZi, no two-person chart, no annual cycles, and no dated prediction.