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Gyehae Day Pillar (癸亥)
— Great Sea Water, the great sea where rivers gather

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 Gyehae day pillar is the 60th 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 Gyehae day pillar?

Picture seeping spring water sitting on the great waters of early winter. Gye Water (癸水) is delicate water, like mist and dew. It's said to be quick to read the room and deeply sensitive — the kind that picks up even what goes unsaid.

Hae Water (亥水) is the water of early winter, the point where rivers return to the sea. It's seen as a seat where thoughts deepen and you prepare for what comes next. In Five Elements terms, the Day Master Gye is Water and the day branch Hae is Water — a shape where top and bottom share the same energy. If the idea of a day pillar is new to you, it's worth reading that first.

What does the Nayin element Great Sea Water mean?

It means the great sea where rivers gather — the water of the vast sea into which every river flows. It's read as an image of embracing whatever comes in, with a depth and scale that are hard to measure. Because Great Sea Water closes out the last of the sixty Gapja, it's also interpreted as an energy that brings a long cycle to a close and prepares for a new one.

The partner that shares Great Sea Water is the Imsul day pillar. Of the two, Gyehae has a yin stem, so even with the same image it's read as the one that gathers it inward.

How do the Day Master Gye and the day branch Hae relate?

The hidden stems of the day branch Hae are Mu, Gap and Im, and the main hidden stem is Im (壬). Seen from the Day Master Gye, the main stem Im is the Ten God Rob Wealth.

You sit on an energy of the same element as you but the opposite polarity. It's a seat that actually draws strength from competition, so your focus is said to rise when something is at stake. Developing a sense for protecting what's yours is often named as its task. If the idea of the Ten Gods is unfamiliar, we recommend starting with the Ten Gods complete guide.

When is the next Gyehae day?

Every day on the calendar has a stem-branch pair too. We used the Mutal Unnie Saju engine to work out when the next Gyehae days fall. The cycle is 60 days.

For someone with a Gyehae day pillar, these are the days when their own stem-branch pair comes back around. Rather than sorting them into good or bad, we suggest using them as days to check in on your own pace. You can continue with the idea of iljin in the story of iljin.

What do the Void branches Ja·Chuk mean?

The Void is set by the group (decade, sun 旬) a day pillar belongs to. The Gyehae day pillar belongs to the Gap-in decade, so its Void branches are Ja·Chuk. Ja (子) and Chuk (丑) are the empty seats. They're two characters of winter energy, so days when they arrive are said to be good for mulling over plans.

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 within its Three Harmony group. Hae is the birth position (saengji 生地) of the Wood frame (木局) of Hae·Myo·Mi, so the Gyehae day pillar's day branch sits in the Jisal position.

Jisal (地殺, Earth Star) is the star of movement and beginnings. When the character in the birth position (saengji) sits in the day branch, a life on the move is said to suit you. It's a seat where your energy actually comes alive with moving house, travel and new surroundings. 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 Gyehae 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.