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Byeong-in Day Pillar (丙寅)
— Fire in the Furnace, the Fire That Burns Long

Day pillars · 2026.08.25 · 5 min read

Of the eight characters in Saju, the two of the day you were born are called the day pillar (日柱). It's the pillar that describes you most closely. Byeong-in is the 3rd stem-branch pair of the sixty Gapja. Below, we'll go through the nature of its Day Master and day branch, its Nayin element, Gongmang, Twelve Sinsal and the next Byeong-in dates, in order.

What kind of combination is Byeong-in?

It's a picture of the midday sun sitting on the dawn that opens spring. Byeong Fire (丙火) is likened to the midday sun. It's seen as an energy that finds it hard to hide, showing itself as it is and lighting up its surroundings.

In Wood (寅木) is the energy of early morning, when the tiger comes down from the mountain. It's considered a position suited to movement and pioneering. In Five Elements terms, the Byeong Day Master is Fire and the In day branch is Wood — the seat you sit on supports you. If the very idea of a day pillar is new to you, it's a good idea to read that first.

What does the Nayin element Fire in the Furnace mean?

It means a fire that burns long inside a furnace — a fire burning within a brazier. Instead of spreading like a wildfire, it gathers in one place and burns long and hot, so it's seen as an image of steady passion and focus. A furnace is also where metal is melted to make vessels, so it's said to be an energy that tempers something into completion.

The pair that shares Fire in the Furnace is the Jeongmyo day pillar. Of the two, Byeong-in has a yang stem, so even with the same image, its energy is seen as showing outwardly.

How do the Byeong Day Master and In day branch relate?

Inside the day branch are hidden Heavenly Stems called hidden stems. In's hidden stems are Mu, Byeong and Gap, and its representative character (main hidden stem) is Gap (甲). Read through the eyes of the Byeong Day Master, this becomes Indirect Resource.

It sits on an energy that helps you, but in a somewhat unusual way. It's seen as a position where intuition and ideas develop, suited to studying paths others don't take. On days when your thoughts multiply, moving your body is said to be the remedy. If the very idea of the Ten Gods is unfamiliar, we recommend starting with The Ten Gods: the complete guide.

When is the next Byeong-in day?

Since one of the sixty Gapja is attached to each day, a Byeong-in day comes once every 60 days. Here are the nearest dates, calculated by Mutal Unnie's Saju engine.

For a Byeong-in day pillar, a Byeong-in day is when the same stem-branch pair as your own day pillar comes around again. Traditionally it's seen as a day when your own energy doubles up, so the ups and downs of your condition show clearly. How the day's stem-branch pair cycles each day continues in the iljin story.

What does Gongmang Sul and Hae mean?

The sixty Gapja are divided into six groups of ten (decades), and the Gongmang of the Gapja decade, which contains Byeong-in, is Sul and Hae. The empty characters are Sul (戌) and Hae (亥). If your birth chart contains these characters, or you meet a day carrying them, it's read as having less energy than usual.

You don't need to drop your plans on a Gongmang day. It's seen as a day that actually gets easier if you lower your expectations a little. The concept is explained in detail in Gongmang explained.

What does the Jisal position mean?

The Twelve Sinsal are set by the role a character plays in its Three Harmony group. In is the birth position of the In-O-Sul Fire group (火局), so the Byeong-in day branch is in the Jisal position.

When a birth-position character falls on the day branch, it's called Jisal. It's a position carrying the power to open a new chapter, so it's read as an energy that comes alive the more you're thrown into unfamiliar settings. The full picture of the twelve sinsal is in The Twelve Sinsal: the complete guide.

Is the day pillar all I need to look at?

A day-pillar reading is the entrance to a Saju, not its conclusion. As the month branch, hour pillar and Daeun are layered onto the two characters of Byeong-in, the same day pillar branches into tens of thousands of variations. If the traits described here don't seem to fit, chances are the other six characters are telling a different story. The order for reading the whole chart is in How to read Saju: the complete guide.