Monthly cycle
The stem and branch of a single Saju month, the finest timing layer a reading uses.
In one sentence
The stem and branch of a single Saju month, the finest timing layer a reading uses.
How it is used
Saju months turn at solar terms rather than at the top of a calendar month, so a monthly window rarely lines up with the dates on your phone. Readers use it to narrow a year down to a season-sized window, which is as precise as this system honestly gets. Below that, any claim about one specific day is coming from somewhere other than the chart.