Day pillar type
Blue Snake (Yi Si): Personality and Matches
Hongsimdang Editorial Team · Last updated
Blue Snake (Yi Si) is the day pillar where flowers and vines that bend with the wind (乙) rests on fire in early summer (巳). In short, it sends inner strength outward and gives it a form others can receive.
What decides the Blue Snake: day stem and day branch
Your day pillar is the stem and branch of the day you were born: the upper character is the day stem and the lower one is the day branch. For Blue Snake (Yi Si), the day stem is 乙 (Yin Wood) and the day branch is 巳 (Snake). The “Blue” in the name is the color of the day stem’s element, and “Snake” is the zodiac animal of the day branch. Both are Hongsimdang’s own labels.
The day stem 乙 is likened to flowers and vines that bend with the wind. You adjust to your surroundings so smoothly that by the time anyone notices, your roots are already deep. The day branch 巳 is fire in early summer. The Snake is popularly pictured as focused, perceptive and deep-thinking, but that is the folk image of the zodiac. The actual reading comes from the element relationship and life stage that follow.
Read as elements, your stem and branch form an output pair, in which the stem pours into the branch. Your stem’s strength flows out toward the branch, so what you carry inside naturally wants to be expressed and given a form. The branch 巳 also holds the hidden stems 戊, 庚, 丙, which lay another side beneath the one that shows.
Seen from your day stem 乙, the day branch 巳 sits at the Bath (Mu Yu) stage of the twelve life stages. It is the stage of washing and dressing up, where your senses and charm are cultivated and a taste for change comes along.
How the Blue Snake shows up at work
Your strength goes out as expression, skill and teaching, so your standing tends to follow the volume and quality of what you produce. Producing nonstop also wears you out faster, so schedule recovery time from the start.
Deep specialist work, analysis, research and strategy are where you shine, and you let results do the talking. You fit in so easily that your own standards slide to the bottom of the list, and you rarely say so when you are worn out.
When you are tired you cut off contact and carry things alone, and thinking too much can leave you stuck.
Tell someone what you have been researching, so the insight in your head gets put into words and tested.
How the Blue Snake shows up in relationships and love
You tend to be the one who gives, through words, gifts and attention. Before you start feeling that nothing comes back, say specifically what you want. The relationship will be steadier for it.
You go deep with only a few people, and once you are attached you do not let go easily.
Someone who respects your time for going deep, and now and then pulls you outside, is a good match.
How the Blue Snake handles money
What you make or express easily turns into income, so talent converts straight into earnings. Money also leaves quickly, so set aside a share the moment it comes in.
Money grows best for you through connections and small openings picked up one at a time, not through a single all-in bet.
Putting money into expertise and knowledge converts directly to income for you. You are strong in fields you have studied deeply and strikingly indifferent to the rest.
Day branches that harmonize with the Blue Snake and ones that clash
The day branch of Blue Snake (Yi Si) is 巳 (Snake). Which day branch the other person has decides the relation between your two branches, as shown below. A day branch that is not listed has no direct harmony or clash with yours.
| Their day branch | Relation between branches | How it reads |
|---|---|---|
| Ox (丑) | Triple Harmony partner | moves in the same direction, and the group is complete once a third branch joins |
| Snake (巳) | Same day branch | like with like |
| Rooster (酉) | Triple Harmony partner | moves in the same direction, and the group is complete once a third branch joins |
| Monkey (申) | Six Harmony, Punishment, Break | pulls together and fills in; rubs, so friction is likely; cracks are likely |
| Tiger (寅) | Punishment, Harm | rubs, so friction is likely; small misunderstandings pile up |
| Dog (戌) | Resentment / Ghost Gate | attracts yet irritates |
| Pig (亥) | Clash | head-on opposition |
Harmony, Clash, Punishment, Harm, Break and Resentment are relations fixed mechanically by the pair of branches. They say nothing about anyone’s character being better or worse.
2027 (Ding Wei year) and the Blue Snake
2027 is a Ding Wei year. The year’s stem and branch change over at the start of spring, around February 4, 2027. The Ding of 2027 is energy that flows out of your day stem naturally, so giving shape step by step to what you like, or letting your expression and making spread gently, is likely this year. The year branch Wei has no direct Six Harmony or Clash with your day branch, so the color of this year shows mainly in its relation to your day stem.
What the day pillar alone cannot tell you
The day pillar is one of the four pillars of a chart. The year, month and hour pillars, the ten-year luck cycles, and Zi Wei Dou Shu and Western astrology readings are not included on this page. Two people with the same Blue Snake can show it differently depending on their other pillars, and your day pillar alone does not settle personality or fate.
To see all four pillars, use the free BaZi calculator. To read a specific question through to timing, a personal reading is the next step.
See the whole chart with the free BaZi calculator →Personal readings →Day Pillar Types →
Frequently asked questions
How do I find out whether I am a Blue Snake?
The day of Blue Snake (Yi Si) comes around once every 60 days, and people born on a 乙巳 day belong to this type. Enter your birth date on the day pillar type index to check.
Why am I a Blue Snake if my birth-year animal is not the Snake?
The birth-year animal comes from the year branch, while the Snake in Blue Snake comes from the day branch 巳. They are two separate calculations. Even if your birth year belongs to another animal, a day branch of 巳 makes your day pillar a Snake.
Which types match the Blue Snake?
Looking only at day branches, the Six Harmony partner of 巳 is the Monkey (申), and the clash comes from the Pig (亥). That is one narrow view. How well two people fit depends on all four pillars and on how they treat each other.
See other types
Same color
- Blue Rat (Jia Zi)
- Blue Ox (Yi Chou)
- Blue Dog (Jia Xu)
- Blue Pig (Yi Hai)
- Blue Monkey (Jia Shen)
- Blue Rooster (Yi You)
- Blue Horse (Jia Wu)
- Blue Goat (Yi Wei)
- Blue Dragon (Jia Chen)
- Blue Tiger (Jia Yin)
- Blue Rabbit (Yi Mao)
Same animal