In Korean, saju means “four pillars.” The Chinese term BaZi means “eight characters.” Since each of the four pillars contains a stem and a branch, both names describe the same basic construction from a different angle.
What they share
- Four pillars associated with birth year, month, day and hour
- A Heavenly Stem and Earthly Branch in each pillar
- Yin-yang and Five Element associations
- A Day Master based on the day stem
- Derived relationships such as the Ten Gods and longer timing cycles
Why use the name Korean Saju?
“Saju” is the familiar Korean term, and the tradition has its own Korean language, history and social context. Calling this service Korean Saju describes its presentation and cultural viewpoint. It does not claim that Korea invented an isolated system unrelated to Chinese calendrical traditions.
Why two readings can differ
Differences are often caused less by the label “Saju” or “BaZi” and more by a school’s calculation and interpretation rules:
| Choice | Possible effect |
|---|---|
| Solar-term boundaries | Can change the year or month pillar near a transition |
| Day boundary | 23:00 versus 00:00 can change the day pillar |
| Time correction | Civil clock time versus solar correction can change the hour pillar |
| Luck-cycle rules | Direction or starting age may differ |
| Interpretive emphasis | Practitioners may weigh season, combinations or useful elements differently |
Our use of the Korean name
Hello Saju explains the chart in English while keeping Korean terms when they add useful context. The tone is deliberately reflective rather than fatalistic. We also publish the calculation conventions, because a disagreement with another calculator should be traceable to an input or rule rather than waved away as mystery.