The 10 Heavenly Stems: Your BaZi Building Blocks

Every BaZi chart is built from two alphabets: Heavenly Stems and Earthly Branches. If the Branches are the ground your chart stands on, the Stems are the sky it reaches toward — the visible, outward layer of who you are.

There are exactly 10 Heavenly Stems. This guide introduces all of them.

What Are Heavenly Stems?

The Heavenly Stems (天干, Tiān Gān) are a set of 10 symbols drawn from ancient Chinese astronomical observation. Each one combines a Five Element energy (Wood, Fire, Earth, Metal, or Water) with a polarity (Yang or Yin) — giving you 5 elements x 2 polarities = 10 unique characters.

Think of polarity as the element's mode: Yang is the bold, expansive expression; Yin is the subtle, refined one. Same element, different style.

One important distinction: the images below describe style, not strength. A tree is not more powerful than grass. An ocean is not stronger than rain. In BaZi, Yang and Yin energies within the same element carry equal force — the imagery captures how they express themselves, not how much power they hold.

The 10 Stems at a Glance

Wood

  • 甲 (Jiǎ) — Yang Wood — The tall tree. Upright, principled, growing steadily upward no matter the conditions.
  • 乙 (Yǐ) — Yin Wood — Young grass. Flexible, adaptive, finding a path around obstacles rather than through them.

Fire

  • 丙 (Bǐng) — Yang Fire — The sun. Warm, generous, radiating energy that lights up everyone around.
  • 丁 (Dīng) — Yin Fire — The candle flame. Focused, perceptive, illuminating details others miss.

Earth

  • 戊 (Wù) — Yang Earth — The mountain. Solid, dependable, a grounding presence that people lean on.
  • 己 (Jǐ) — Yin Earth — The garden soil. Nurturing, receptive, quietly cultivating growth in others.

Metal

  • 庚 (Gēng) — Yang Metal — The sword. Direct, decisive, cutting through ambiguity with clarity.
  • 辛 (Xīn) — Yin Metal — The jewel. Refined, detail-oriented, with high standards and quiet elegance.

Water

  • 壬 (Rén) — Yang Water — The ocean. Vast-minded, adventurous, flowing with powerful momentum.
  • 癸 (Guǐ) — Yin Water — Gentle rain and dew. Intuitive, introspective, nourishing ideas from within.

Where Stems Appear in Your Chart

Your BaZi chart has four pillars — Year, Month, Day, and Hour — one for each time unit of your birth. Each pillar carries a Heavenly Stem on top and an Earthly Branch on the bottom:

That gives you four Heavenly Stems across the top row — four visible expressions of elemental energy.

The Day Master: The Stem That Represents You

Of the four stems, one matters most: the Day Stem, also called your Day Master (日主, Rì Zhǔ). This is the single character that represents you in the chart — your core personality, your default way of engaging with the world.

When someone says "I'm a Jiǎ Wood person" or "My Day Master is Xīn Metal," they're referring to this one stem.

The other three stems (Year, Month, Hour) represent elements of your environment — family origin, social context, career energy, and inner aspirations. But the Day Master is always home base.

Why This Matters

Knowing the 10 Heavenly Stems gives you the vocabulary to read any BaZi chart. Once you can identify each stem's element and polarity, you'll start noticing how they interact — supporting, challenging, and balancing each other across the four pillars.

That interplay is where the real insight lives.

See Your Stems

Curious which Heavenly Stems appear in your chart? Our free BaZi calculator generates your Four Pillars in seconds — no signup required. Find your Day Master and see all four stems at once.

Get your free chart reading at guanweibazi.com

Keep Exploring

Heavenly Stems are just one layer. Your full chart considers Earthly Branches, Ten Gods patterns, and Luck Cycles for a complete picture.