The Heavenly Stems are ten basic symbols
Korean Saju uses ten Heavenly Stems.[1]
Their traditional sequence is:
甲 · 乙 · 丙 · 丁 · 戊 · 己 · 庚 · 辛 · 壬 · 癸
At this stage, it is more useful to understand them as basic classification units within the chart than as ten personality types.
The ten Stems are divided into Yin and Yang
The Heavenly Stems are classified as Yin or Yang.[1][2]
- Yang: 甲 · 丙 · 戊 · 庚 · 壬
- Yin: 乙 · 丁 · 己 · 辛 · 癸
This distinction is not a ranking of good and bad or superior and inferior.
A Yang Stem does not mean a better or stronger person, and a Yin Stem does not mean a weaker or less favorable person.
The Stems are also connected to the Five Elements
The ten Stems are also classified through the Five Elements.[2]
- Wood: 甲 · 乙
- Fire: 丙 · 丁
- Earth: 戊 · 己
- Metal: 庚 · 辛
- Water: 壬 · 癸
Two Stems are associated with each Element, and those two are distinguished again through Yin and Yang.
This gives a simple structural pattern: one Stem → a Yin/Yang category → a Five-Element category.
A classification is not a verdict about a person
These classifications are a language for understanding chart structure.
The presence of a particular Stem does not, by itself, determine a person's personality, career, health, wealth, marriage, or future events.
Wood is not inherently better than Fire, and Yang is not inherently superior to Yin.
Classification and individual interpretation are different steps.
The Stems appear again when learning the Day Master
The same Stem classifications return later when learning about the Day Master.
The Day Master is not the entire Day Pillar. It is the Heavenly Stem of that Pillar used as a traditional interpretive reference point.
Even then, one Stem is not treated as a complete description of a person. It must be considered in relation to the rest of the chart.
For now, learning the ten names and the two classification axes is enough.