Sonless Day
List dates in a selected month that match an internal heavenly-stem rule. The current rule differs from the lunar-day-ending convention associated with son-eomneun-nal, so the name must not imply calendar equivalence.
- Runs in your browser
- Nothing is uploaded
- No signup; device limits apply
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How to use this tool
Choose a year from 1900 to 2100 and a month. The implementation maps day offsets into a sixty-day cycle and selects the two stems corresponding to mu and gi.
Results and examples
The tool visits each day and retains dates in those stem categories. It does not directly test lunar days such as the ninth or tenth, so compare a real lunar calendar before using it for scheduling.
Limitations
- Accurate lunar-based son-eomneun-nal dates are not established by this implementation.
- A listed date does not guarantee good luck or safety for a move or event.
Fields
| Field | Guidance and constraints |
|---|---|
| Solar year | Check the unit and format displayed beside this field. |
| Month | Check the unit and format displayed beside this field. |
| Date list | Check the unit and format displayed beside this field. |
Data handling
Processing stays in the current browser tab; the site does not upload tool input for the calculation itself.
Sources
Frequently asked questions
Which dates does the rule select?
The tool visits each day and retains dates in those stem categories. It does not directly test lunar days such as the ninth or tenth, so compare a real lunar calendar before using it for scheduling.
Is it the same as the lunar convention?
Accurate lunar-based son-eomneun-nal dates are not established by this implementation. A listed date does not guarantee good luck or safety for a move or event.
