A Gui Water Day Master is the yin water Heavenly Stem sitting on the day pillar of a Four Pillars (Bazi) chart. Traditional books picture Gui as dew, mist, and fine rain: water that beads, seeps, and gathers on surfaces, the moisture that never quite becomes a named river. You read that label from the day stem only: when the birthday stem is Gui (癸), the chart carries this name, and year, month, and hour stems do not retitle it. How full or thin the dew runs still depends on the month branch and the rest of the chart.
What dew means on a Gui day stem
Gui (癸) is the tenth of the ten Heavenly Stems and the yin half of water. The working image is overnight dew on grass, a mist that wets sleeves, drizzle that soaks in before anyone bothers to name a current. That picture names the element as water and the polarity as yin, fine, and clinging. When a reader asks what a Gui Water Day Master is, the useful answer stays here: the day stem is Gui, the water is the dew kind, and every later note about strength is a note about how much of that dew the month and the neighboring stems leave standing.
Yin water in this teaching is easy to miss if the mind jumps straight to oceans. Dew collects from air, sits on a surface, and dries when fire months run hot or when earth months pack around it; it also feeds wood without looking like a flood. Traditional notes weigh a Gui stem by how it clings and how it is spent. Keep the image small on purpose: the moment the prose turns to character sketches—clever, yielding, hard to pin down—it has left the stem and started inventing a person. Because dew is thin, the same Gui label can look full in winter air and threadbare in late-summer ground without the stem changing, and readers who freeze “Gui” as a fixed type then argue with the month as if climate were optional decoration.
How Gui water sits beside Ren water

Ren (壬) is yang water: rivers, seas, the water that already has a name and a direction. Gui is the moisture that has not become that river. Both like metal upstream and both feel earth as control, yet a Ren day stem is read as a current and a Gui Water Day Master is read as precipitation and film. Paste river language onto Gui and you will overstate force, then miss how fast the stem can evaporate or soak away. Keep dew in the sentence when the day stem is Gui, and keep the river when it is Ren; metal can feed both, and it still feeds two different bodies of water.
Where the day master sits in the four pillars
A Bazi chart is four columns: year, month, day, and hour, each with a Heavenly Stem on top and an Earthly Branch under it. The day master is the stem of the day column only. A Gui year with a Jia day is a Jia chart; a Jia year with a Gui day is a Gui Water Day Master. People reverse this constantly because the year animal is the piece of Chinese calendrics they already know, so they promote the year stem into a job that belongs to the day.
- Build the four pillars from a birth date and hour with a chart tool; do not guess the day stem from the zodiac animal.
- Find the day column, the pillar labeled day (often the third column in a year-month-day-hour row).
- Read only the Heavenly Stem of that column. If it is Gui, that is the day master.
The month branch still decides whether that Gui sits in season, and neighboring stems can add metal, earth, or wood without renaming the day master. Water elsewhere in the chart is a resource question, and the day-stem label is Gui only when the day stem itself is Gui.
Seasonal strength for Gui water
Once the day stem is Gui, traditional strength notes follow the month. Winter months are water’s season, so Gui tends to sit in its own element; earth months control water; wood months drain water into growth; metal months generate water; fire months are heat, and dew is the first water to go.
| Month quality |
Five-element role |
Traditional reading for Gui |
| Winter (water in season) |
Same element |
Dew sits full |
| Earth months |
Earth controls water |
Gui is pressed |
| Wood months |
Wood drains water |
Gui is spent on growth |
| Metal months |
Metal generates water |
Gui is fed |
| Fire months |
Seasonal heat |
Dew thins first |
Read the table as climate, a stem-in-month judgment used to keep the rest of the chart in proportion.
Metal beside Gui, and the Xin stem
Metal generates water, so a metal month or a metal stem beside Gui is the usual source note, and Xin is yin metal, often pictured as jewelry or small precious metal. For the metal-water contrast in English, use the existing Xin Metal Day Master page rather than restating that whole stem here: Xin as the metal that can feed, Gui as the dew that can receive.
How to look the stem up in a chart
If the four pillars are not already on the desk, start with the English Bazi chart tool and enter the birth date and time. The day stem prints as one of ten, and you want Gui on the day; the BaZi Calculator page walks the same mapping. Do not convert from the animal year and stop: the animal year is the year branch, and the day master is a stem on a different pillar.
- Reading the year stem or the zodiac animal as the day master
- Calling every water chart Gui when the day stem is Ren
- Treating the day-master name as a personality sketch or a fate sentence
What a day-master label cannot tell you
A Gui Water Day Master names the day stem and the dew image, and it does not assign a character, a career, a marriage outcome, or a ranking of luck. Stay with the stem, the picture, the season table, and the lookup.