Every BaZi app asks for birth date and time, then prints pairs like Ji-You or Bing-Wu. Those are not random codes. They are heavenly stem + earthly branch pairs (天干地支). They build four pillars, the sexagenary cycle, and the zodiac animals hiding inside the twelve branches.
Mallria uses stem-branch logic for wearable color tags on match flow. Deep primers on Lushn: heavenly stems · earthly branches (天干简体 · 地支简体). Below is the grammar for gifts and wear context.
Two halves of one pillar
| Part | Count | What it carries |
|---|---|---|
| Heavenly Stem (天干) | 10 | Yin/yang + five-phase flavor on the “sky” side |
| Earthly Branch (地支) | 12 | Animal zodiac, hidden stems, seasonal gates |
Each chart pillar stacks one stem on one branch, like a two-character syllable. Four pillars → eight characters → “BaZi.”
The ten heavenly stems (天干)
Stems cycle in order; each has yin/yang polarity and a phase:
| Stem | Phase | Yin/Yang | Wearable color shorthand |
|---|---|---|---|
| Jia 甲 | Wood | Yang | Strong green, vertical lines |
| Yi 乙 | Wood | Yin | Soft green, botanical prints |
| Bing 丙 | Fire | Yang | Bright red, sun warmth |
| Ding 丁 | Fire | Yin | Candle red, purple highlights |
| Wu 戊 | Earth | Yang | Mountain brown, ochre |
| Ji 己 | Earth | Yin | Sand, clay, camel knit |
| Geng 庚 | Metal | Yang | Steel, bold silver |
| Xin 辛 | Metal | Yin | Polished silver, white gems |
| Ren 壬 | Water | Yang | Ocean navy, flowing drape |
| Gui 癸 | Water | Yin | Black, rain-gray, pearl luster |
Your Day Master (日主) is the stem of your day pillar, the “you” anchor in many BaZi traditions. Color gifts keyed to Day Master use this row; see day master colors & wearables.
The twelve earthly branches (地支)
| Branch | Animal | Rough season gate | You may already know it as… |
|---|---|---|---|
| Zi 子 | Rat | Winter deep | Midnight hour sector |
| Chou 丑 | Ox | Winter turning | Year animal for some Jan babies |
| Yin 寅 | Tiger | Spring start | Lunar New Year animal chatter |
| Mao 卯 | Rabbit | Spring | Jade rabbit pendants |
| Chen 辰 | Dragon | Spring rain | Dragon year merch |
| Si 巳 | Snake | Summer start | |
| Wu 午 | Horse | Summer peak | |
| Wei 未 | Goat | Summer earth | |
| Shen 申 | Monkey | Autumn start | |
| You 酉 | Rooster | Autumn metal | |
| Xu 戌 | Dog | Autumn earth | |
| Hai 亥 | Pig | Winter start |
Branches also clock the two-hour periods for your hour pillar, which is why birth time matters in match flow. Animal jewelry uses year branch only unless you know the full chart.
How stems and branches combine: the 60 cycle
Ten stems and twelve branches interlock into a 60-pair sexagenary cycle (六十甲子). Year, month, day, and hour pillars are all positions in this rolling calendar, not independent random draws. Apps hide the math and print the pairs.
Example: Bing-Wu on a day pillar means stem Bing (Yang Fire) and branch Wu (Horse, summer Fire territory). Gift copy might say “warm red tones” as symbolic Fire color — palette language.
Stems/branches vs almanac vs personal chart
| Tool | Uses stems/branches? | Personal? |
|---|---|---|
| Today’s almanac day pillar | Yes, one pair for everyone | No, L1 shared calendar |
| Your four birth pillars | Yes, four pairs fixed at birth | Yes, needs birth data |
| Flow day overlay | Yes, moving pair vs your chart | Yes, Tier 2 |
| Luck pillars (大运) | Yes, ten-year pairs | Yes, luck pillar primer |
Common misconceptions
- “My zodiac animal is my whole BaZi.” Animal = one branch, usually year. Three other pillars still differ.
- “Stems and branches are planets.” Western planets are a parallel system; see planetary stones vs birthstones.
- “Memorize all 60 pairs before gifting.” You do not. Know month/day/time, let software print pillars, pick a color story from Day Master or branch animal.
- “Branch clash means cancel the wedding.” Clash language is practitioner territory. Gift copy should stay with color and animal symbolism.
Optional wearable landing
- Day Master stem color: bracelet or scarf in the phase row above; needs birth time.
- Year branch animal: jade zodiac pendant when you are not chart-deep yet.
- Five-phase literacy: rainbow bead band in five element colors.