Lunar Conversion Quick Reference

1) Gather input
- Mother birth date (Gregorian)
- Conception reference date (exact / due / LMP)

2) Estimate conception if needed
- due -> due date minus 266 days
- lmp -> lmp plus 14 days

3) Convert conception date to lunar
- Identify lunar year via CNY boundary
- Resolve lunar month and leap status

4) Calculate lunar age at conception
- Western age at conception + boundary adjustment

5) Chart input
- Use (lunar age, lunar month)

Reminder:
Traditional chart tools are for cultural/entertainment use only.