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Climate-Balancing (Johu 調候): Reading Saju by Birth Season
— why winter births look for Fire and summer births for Water

2026-10-30 · Mutal Unnie editorial team

What is johu (調候), climate-balancing in Saju?

Johu is the practice of balancing a Saju chart's temperature and humidity. The characters mean “adjust” (調) and “climate” (候), so the word literally says “even out the climate.” You look at how cold, hot, dry or damp the birth season made the whole chart, then balance it with the opposite energy. This site calls it climate-balancing.

It's the same instinct as reaching for a heater in midwinter and cold water in midsummer. For a cold chart, Fire (火) is the first element to think of as needed; for a hot chart, Water (水). When the element picked this way is treated as the Useful God candidate, it's called the climate-balancing Useful God (johu yongsin).

Johu reads four qualities: cold and warm (hannan 寒暖), dry and damp (joseup 燥濕). That's why readers often say they're “checking hannan-joseup (寒暖燥濕).”

How do I know which season I was born in, in Saju?

Not by the calendar month, but by your month branch (wolji 月支), the Earthly Branch of your birth month. Saju months don't turn on the 1st; they turn at the entry time of a jeol (節) solar term such as Ipchun or Gyeongchip. So two people born on November 7 can be an autumn birth and a winter birth depending on the hour.

In, Myo and Jin are spring; Sa, O and Mi summer; Sin, Yu and Sul autumn; Hae, Ja and Chuk winter. Jin, Mi, Sul and Chuk, which close each season, are all Earth and are read as transitions; Jin and Chuk are damp earth, Mi and Sul dry earth. You can see your month branch in the free manseryeok calculator, and entry times, which shift a little every year, are listed to the minute in The 24 Solar Terms of 2027.

The seasons in this table follow the solar terms of the East Asian calendar, which match the northern hemisphere. If you were born in Australia, South Africa or South America, read the FAQ at the end on whether to flip the seasons.

Why do winter births look for Fire first and summer births for Water?

Because the core of johu is to ease a temperature that leans one way with the opposite energy. A winter chart from the Hae, Ja or Chuk month is seen as frozen, a place where nothing grows easily, so it looks first for Byeong Fire (丙火), the stem compared to the sun in the sky. A summer chart from the Sa, O or Mi month is seen as parched, so it looks first for Im Water (壬水), a large body of water, or Gye Water (癸水), rain and dew.

The word “first” matters here. A winter birth with plenty of Fire already in the chart doesn't need more warming, and a summer birth with enough Water moves on to other questions. The season is the starting point; you still have to recheck the temperature of the whole chart.

How is climate-balancing different from strengthen-or-restrain?

Johu looks at the chart's temperature; strengthen-or-restrain looks at how strong your Day Master is. Strengthen-or-restrain, eokbu (抑扶), means holding back what's too strong and supporting what's too weak. You first judge whether the Day Master is strong or weak, then choose an element that drains a strong one or feeds a weak one as the Useful God.

The classic most often named for climate-balancing is the Gungtong Bogam (窮通寶鑑, known in Chinese as Qiongtong Baojian). It's known for setting each of the ten Day Masters against each of the twelve months and listing which characters are needed first.

In practice the two are used together rather than one or the other. Usually strengthen-or-restrain sets the direction, and for deep-winter or high-summer births climate-balancing is checked as well. When both point to the same element the call is easy; when they differ, schools and readers disagree on which to put first.

Can the same Day Master be read differently depending on the season?

Yes. Even with the same Day Master, a different birth season changes which energy is needed first. For a Gyeong Metal (庚金) Day Master, for example, a summer birth first suggests cooling hot metal with Water, while a winter birth first suggests warming cold metal with Fire. Born in autumn, its own season, the metal is already firm, so readers often look first for ways to drain its strength rather than adjust its temperature.

Here's an example calculated by the Mutal Unnie engine. A birth at 14:30 on May 15, 1990 (entered as Korea time) gives a Gyeong-o (庚午) year, Sinsa (辛巳) month, Gyeongjin (庚辰) day and Gyemi (癸未) hour: Gyeong Metal in early summer, just past Ipha.

1. Check the seasonThe month branch Sa (巳) opens summer, and with the year branch O (午) and the dry-earth hour branch Mi (未), the chart leans warm.
2. Read it by climateIt's a hot chart, so Water comes first. The Gye Water (癸水) in the hour stem and the Gye Water hidden in the day branch Jin (辰) do the cooling.
3. Read it by strengthThe month branch doesn't support Gyeong Metal, but the day branch Jin Earth, the year stem Gyeong Metal, the month stem Sin Metal and the hour branch Mi Earth all lend support, so it can be seen as a borderline chart leaning strong. If it's strong, Water, its Output star, which drains strength, becomes a candidate.
4. See if they overlapIf climate and strength both point to Water, the call becomes much easier. If the strength judgment changes, the conclusion can change too, and that caveat stays.

If the same Gyeong Metal were born in the deep-winter Ja month, the reading would flip and look first for Fire to warm it. How to read the characters hidden inside branches is summed up in the Saju Glossary under hidden stems.

Is a baby born after Ipdong 2026 a winter baby in Saju?

Yes. In Saju, winter births start at Ipdong, 18:52 KST on November 7, 2026 (09:52 UTC). By the Mutal Unnie engine, the Gihae (己亥) month begins at that moment, and from Daeseol at 11:52 KST on December 7 it moves into the Ja (子) month, deep winter. A baby born earlier on November 7, before 18:52 KST, belongs to the Musul (戊戌) month, late autumn.

The three winter months (Hae, Ja and Chuk) last until Ipchun at 10:46 KST on February 4, 2027. For a baby born this winter, johu makes Fire the first energy to check, but whether the chart already holds Fire, and how strong the Day Master is, can change the judgment. “Winter baby, needs Fire” isn't a conclusion; it's the question that starts the check.

What changes around Ipdong is in Ipdong 2026, the Start of Winter, and how each month's energy shifts is in How to read monthly luck.

How can I check my birth season on Mutal Unnie?

Enter your date and time of birth in the free web manseryeok calculator to get your month branch, then match it with the table above to see your season and the starting point for climate-balancing. The calculator also lets you switch on corrections for daylight saving time and Korea's former standard times.

The app calculates your chart from the clock time you enter, treated as Korea time (KST), and the one-line rhythm for the day and adding events are free. To see when warming or cooling energy arrives as your 10-year luck cycles change, read Daeun — the big rhythm that changes every 10 years alongside this.

Start with today's rhythm

Available on iPhone and Android. Daily rhythm cards and adding events are free. Check the cost before opening a paid reading. Store availability and app language support depend on the listing.