Heavenly Stems Meaning: The 10 Stems as Personality Archetypes

The ten Heavenly Stems (천간 cheongan, 天干) are the “sky” characters of a saju chart: five elements, each in a yang and a yin version. In Korean saju they are read as nature images, a tall tree, a candle, a mountain, a raindrop, and each image doubles as a personality archetype. The stem of your day pillar, your day master, is the one most people mean when they ask “what type am I?”

The stems are older than saju itself. In ancient China they counted the days of a ten-day week, and they later paired with the twelve Earthly Branches to form the 60-step sexagenary cycle.

Below, the Moon Rabbit introduces all ten, one friendly archetype at a time.

The ten stems at a glance

Stem	Korean	Element	Polarity	Traditional image
甲	갑 gap	wood	yang	a tall tree
乙	을 eul	wood	yin	vine, grass, flowers
丙	병 byeong	fire	yang	the sun
丁	정 jeong	fire	yin	candle, lamp, starlight
戊	무 mu	earth	yang	mountain, wide plain
己	기 gi	earth	yin	garden soil, farmland
庚	경 gyeong	metal	yang	raw ore, an axe
辛	신 sin	metal	yin	a jewel, a fine blade
壬	임 im	water	yang	ocean, great river
癸	계 gye	water	yin	rain, dew, mist

The pattern is simple: odd-numbered stems are yang, even-numbered stems are yin. Yang versions are described as big, direct and outward. Yin versions are described as refined, adaptive and inward. Neither is better; a forest needs both trees and moss.

The ten archetypes, element by element

Wood: 甲 gap and 乙 eul

甲 gap, the tall tree. Upright, growth-minded, happiest when reaching for something. Practitioners describe 甲 people as natural initiators who like clear principles and a straight path. The growth edge: trees don’t bend easily, so flexibility can take practice. Fun fact: 甲 is so strongly linked with “first” that Korean contracts still call the first party gap (갑) and the second eul (을).

乙 eul, the vine and the flower. Where 甲 pushes straight up, 乙 finds a way around. It is read as sociable, resilient and quietly persistent, able to thrive by connecting with others. The growth edge: vines lean on supports, so 乙 types are encouraged to trust their own footing.

Fire: 丙 byeong and 丁 jeong

丙 byeong, the sun. Bright, generous, visible from far away. 丙 is read as warm-hearted and expressive, the person who lights up a room without trying. The growth edge: the sun shines on everyone equally, so 丙 types may forget to focus the warmth where it’s needed most.

丁 jeong, the candle. A smaller flame, but one you can read by. 丁 is described as attentive, thoughtful and devoted, lighting the way for a few people rather than a stadium. Practitioners link it with care, craft and inner conviction. The growth edge: a candle flickers in the wind, so 丁 types benefit from sheltered, steady routines.

Earth: 戊 mu and 己 gi

戊 mu, the mountain. Solid, calm and hard to move. 戊 is read as dependable, protective and patient, the friend everyone leans on. The growth edge: mountains don’t change quickly, so new ideas may need time to be welcomed.

己 gi, the garden soil. Soft, fertile and nurturing. 己 is described as practical, receptive and good at helping things grow, whether that’s a plant, a project or a person. The growth edge: soil takes in everything, so 己 types are encouraged to set gentle boundaries.

Metal: 庚 gyeong and 辛 sin

庚 gyeong, the raw ore or axe. Strong, decisive and a little rough around the edges. 庚 is read as brave, loyal and justice-minded, happy to cut through confusion. The growth edge: an axe is a blunt instrument, so tact is the skill 庚 types grow into.

辛 sin, the jewel. Refined, precise and beautiful when polished. 辛 is described as detail-loving, aesthetic and sensitive to quality, in things and in people. The growth edge: jewels scratch, so 辛 types may take criticism to heart and do well with kind, specific feedback.

Water: 壬 im and 癸 gye

壬 im, the ocean. Vast, moving and full of ideas. 壬 is read as curious, adaptable and big-picture, drawn to travel, learning and wide horizons. The growth edge: oceans have no walls, so structure and follow-through are worth building.

癸 gye, the rain. Quiet, gentle and everywhere at once. 癸 is described as intuitive, empathetic and imaginative, nourishing others in ways they may not notice. The growth edge: rain can turn to fog, so 癸 types benefit from saying clearly what they need.

How stems interact in a chart

Stems don’t sit alone. In a chart, each is judged against the day master through the ten gods (십성 sipseong), and certain pairs are said to “combine.” The classic stem combinations (천간합 cheonganhap) join each of the first five stems with the stem five places after it, always one yang and one yin:

Pair	Combined element
甲 gap + 己 gi	earth
乙 eul + 庚 gyeong	metal
丙 byeong + 辛 sin	water
丁 jeong + 壬 im	wood
戊 mu + 癸 gye	fire

In saju symbolism, a combination is like two people deciding to cooperate: each gives up a little of its original character to create something new. Readers use these pairs as one small clue among many, including in playful compatibility (궁합 gunghap) chats. They are conversation starters, never a scorecard for a relationship.

Stems also respond to the five-element loops. Wood feeds fire, fire makes earth, earth bears metal, metal gathers water, water nourishes wood. So a 丁 candle chart that also has 甲 tree characters is read as having “firewood,” while plenty of 癸 rain around a 丙 sun is read as cloudy weather that asks for balance.

Your stem as a rice cake

SajuBunny has a sweet shorthand: each day-master stem is matched with a Korean tteok (떡), or rice cake.

Day master	Tteok
甲 gap	garaetteok (long cylinder rice cake)
乙 eul	songpyeon (half-moon Chuseok cake)
丙 byeong	mujigae-tteok (rainbow layers)
丁 jeong	kkultteok (honey-filled)
戊 mu	sirutteok (steamed layer cake)
己 gi	baekseolgi (snow-white steamed cake)
庚 gyeong	jeolpyeon (stamped patterned cake)
辛 sin	gyeongdan (little coated balls)
壬 im	yakbap (sweet rice with nuts and dates)
癸 gye	injeolmi (soybean-dusted)

Your chart’s strongest element adds a topping: mugwort for wood, strawberry for fire, sweet pumpkin for earth, sesame for metal and black sesame for water.

FAQ

What are the 10 Heavenly Stems?

They are ten characters used in East Asian calendars and in saju: 甲 gap, 乙 eul, 丙 byeong, 丁 jeong, 戊 mu, 己 gi, 庚 gyeong, 辛 sin, 壬 im and 癸 gye. Each is a yang or yin form of one of the five elements. In a saju chart, the stems sit on top of each pillar, and the day-pillar stem represents you.

How do I find my Heavenly Stem?

The stem that matters most is your day master, the stem of your birth-day pillar. It can’t be worked out from your birthday alone, because days follow a continuous 60-day cycle, so you look it up in an almanac or use a saju calculator. Your birth-year stem also exists, but it describes the year’s atmosphere rather than your core self.

What is the difference between yin and yang stems?

Each element comes in two versions. The yang stem is the larger, more outward form, like a tree, the sun or the ocean. The yin stem is the finer, more inward form, like a vine, a candle or rain. Practitioners describe yang stems as direct and expansive, yin stems as subtle and adaptive. Both are equally valued in saju symbolism.

Which Heavenly Stem is the best?

None. Saju treats each stem as one part of a larger ecosystem, and a stem’s qualities depend on the rest of the chart. A candle is precious at night and less noticeable at noon; a mountain is steady but slow. Practitioners focus on balance: what the chart has plenty of and what it could use more of, rather than ranking the ten types.

Try it with the Moon Rabbit

Wondering whether you’re a tree, a candle or a raindrop? Take the What tteok are you? quiz to find your day-master rice cake, or get your free saju card for all eight characters.

Saju is a cultural tradition, not a science. SajuBunny readings are for fun and self-reflection, not professional advice.

Sources

For fun and self-reflection. Saju is a traditional way of looking at yourself, not a prediction or professional advice.