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Gyeong-o Day Pillar (庚午)
— Roadside Earth, soil packed firm by the road

Day pillars · 2026.08.25 · 5 min read

The day pillar (ilju 日柱) is the stem-branch pair of the day you were born — the pillar that represents you yourself in Saju (四柱, the Four Pillars). The Gyeong-o day pillar is the 7th of the sixty Gapja (六十甲子, 60 stem-branch pairs). In this note, we'll lay out its structure — Day Master and day branch, Nayin element (napeum ohaeng 納音五行), Gongmang (空亡, the Void) and Twelve Sinsal (十二神殺, twelve symbolic stars) — using calculations from the Mutal Unnie Saju engine.

What kind of pairing is the Gyeong-o day pillar?

Picture hard iron sitting on the fire of midday. Gyeong Metal (庚金) is an energy as decisive as autumn frost. Its strength is the resolve to clear away what needs clearing.

O Fire (午火) is the noonday energy of a horse galloping across the fields. It's counted as a seat charged with speed and passion. In Five Elements terms, the Day Master Gyeong is Metal and the day branch O is Fire — a shape in which your seat keeps you on your toes. If the idea of a day pillar is new to you, it's worth reading that first.

What does the Nayin element Roadside Earth mean?

It means soil packed firm by the road — the earth alongside a main road. Trodden by countless people and carts until it hardens, it's read as an image of being firmed up by experience. A road is also what carries people from place to place, so Roadside Earth is said to be an energy with many comings and goings of connections, finding its use among them.

The partner that shares Roadside Earth is the Sinmi day pillar. Of the two, Gyeong-o has a yang stem, so even with the same image it's read as the one that moves first and shows it outwardly.

How do the Day Master Gyeong and the day branch O relate?

The hidden stems held in O, the day branch of the Gyeong-o day pillar, are Byeong, Gi and Jeong. Matching the main stem Jeong (丁) against the Day Master Gyeong, the Ten God of this seat reads as Direct Officer.

You sit on an energy of order and standards. A wish to conduct yourself properly runs underneath, so it has long been read as a seat of trust and honor. Diligence in keeping to your duties is counted as its strength. What each of the ten Ten Gods means is in the Ten Gods complete guide.

When is the next Gyeong-o day?

A Gyeong-o day comes around once every 60 days. Here are the nearest Gyeong-o days, calculated with the Mutal Unnie Saju engine.

A day carrying the same stem-branch pair as your day pillar is seen as a day when your own energy doubles up. If you jot down how you felt on days like these, your rhythm starts to show. How the daily stem-branch pairs rotate is explained in the story of iljin.

What does Gongmang Sul and Hae mean?

The sixty Gapja are grouped into six decades (sun 旬) of ten, and the Gyeong-o day pillar belongs to the Gapja decade, whose Void branches are Sul·Hae. The 'empty' characters are Sul (戌) and Hae (亥). If these characters are in your birth chart, or on days that carry them, the energy is read as having less force behind it than usual.

Being empty doesn't mean bad — it's also interpreted as a seat where attachment has less of a hold. For the full guide to reading the Void, continue with What is Gongmang?

What does the Jangseongsal position mean?

O is the peak position (wangji 旺地) in the Three Harmony Fire frame (火局) of In·O·Sul. That's why the day-branch seat of the Gyeong-o day pillar is read as Jangseongsal in the Twelve Sinsal.

Jangseongsal (將星殺, General Star) is the star of standing at the center. As the character in the position where energy is at its height (wangji), it's seen as a seat that gains strength when leading from the middle of a group. It has long been called the star of the general. The full picture of the twelve sinsal is in the Twelve Sinsal complete guide.

Is the day pillar all I need to look at?

A day pillar reading is the entrance to Saju, not the conclusion. Once the month branch, hour pillar and 10-year luck cycles are layered onto the two characters of the Gyeong-o day pillar, the same day pillar branches off in tens of thousands of directions. If the traits described here don't quite fit, there's a good chance the other six characters are telling a different story. The order for reading the whole chart is in the complete guide to reading Saju.