Korean Saju · BaZi · Western Astrology
Understand your patterns.
Choose your timing.
BaZi means “Eight Characters,” the Chinese name for the Four Pillars birth chart also used in Korean Saju. Hongsimdang connects that structure with Zi Wei Dou Shu and Western astrology for practical questions about relationships, work, money, and everyday decisions.
Start with the question you have
Free tools and guides in the Hongsimdang reading style
Calculations stay deterministic. Explanations stay practical, limited, and clear about uncertainty.
One person
Free BaZi calculator
See the Four Pillars, Day Master, Five Element balance, role balance, and current luck-cycle flow.
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Two people
Free BaZi compatibility
Compare two independently localized charts through attraction, stability, repair, long-term rhythm, and tension.
Open →Twelve palaces
Free Zi Wei Dou Shu calculator
Build the Life Palace, Body Palace, Five Element Bureau, main stars and twelve-palace birth chart.
Open →
Western astrology
Free birth chart calculator
See planetary degrees, rising sign, Midheaven, Placidus houses and major natal aspects.
Open →Plain-English guide
How a Saju reading works
Learn what BaZi can describe, what birth time changes, and why a chart is not a fixed verdict.
Open →Personal reading · $9.99 USD
Go beyond the chart into relationships, work, money and decisions
The Personal Pattern Reading connects your Four Pillars with Zi Wei Dou Shu and Western astrology, then explains the overlap in practical English without treating it as a fixed verdict.