Methodological Notice & Astronomical Scope
Calculations utilize astronomical synodic month constants (mean length ~29.53059 days) alongside historical Chinese sexagenary stem-branch cycles and lunisolar calendar intercalations. Cultural traditions, regional leap-month assignments, and calendar boundaries may differ by country. All tools and predictive calculators are provided strictly for educational, historical, and cultural research purposes.
Regulatory & Google AdSense Publisher Compliance
This website strictly adheres to Google Publisher Policies, GDPR, and CCPA standards. Third-party advertising partners (including Google) may use cookies to serve personalized or contextual advertisements based on visits to this and other websites. Calculations occur strictly on-device in client memory; no user-entered dates or sensitive inputs are ever logged, transmitted, or sold.