庚寅 Day Pillar — Geng Yang Metal Day Master (yin Tiger)
The geng yin (庚寅) day pillar means you are a Geng Yang Metal day master sitting on the yin (Tiger, 木) branch. Its nayin is Pine and Cypress Wood (松柏木). Below: what the stem says, what the branch adds, and how the pair interacts.
The 庚寅 day pillar at a glance
| Position in the cycle | No. 38 of the 60 day pillars |
|---|---|
| Day master (heavenly stem) | 庚 — Geng Yang Metal (Metal) |
| Day branch (earthly branch) | 寅 — yin, the Tiger (Wood) |
| Hidden stems | 甲 (Jia Wood), 丙 (Bing Fire), 戊 (Wu Earth) |
| Nayin | Pine and Cypress Wood (松柏木) |
| Stem–branch relation | the stem controls the branch |
What the day pillar means in BaZi
In the Four Pillars of Destiny (BaZi), the day pillar is the pillar of the self: its heavenly stem is your day master, the element that represents you, and its earthly branch is the ground you stand on, closest to your inner life and (traditionally) your marriage palace. All other pillars are read in relation to the day stem. That is why the 60 day pillars are the most-asked-about combinations in Chinese astrology: one glance at this one character pair already sketches a person.
The day master: Geng Yang Metal (庚)
Geng is the raw ore and the blade: hard, decisive, and shaped by pressure. This day master values straightforwardness, cuts through noise to act, and needs a cause worthy of its edge.
The day branch: yin Tiger (寅, 木)
Yin is the Tiger: bold spring wood on the edge of catching fire. As a day branch it adds drive, an appetite for risk, and a need for open ground.
The yin branch hides Jia Wood, Bing Fire, Wu Earth in its depths, which the full chart reads as secondary characters underneath the surface.
How the stem and branch interact
The stem takes charge of the branch in the controlling cycle: this is a day master that organizes its environment rather than adapting to it.
What it is like when Geng Yang Metal sits on yin
The day stem takes charge of the branch: in the controlling cycle, the stem governs the element beneath it. Classical texts read the element you control as your wealth, so this pairing is traditionally described as a day master standing on its own holdings — hands-on with its environment,organising what it sits on rather than adapting to it. The traditional caution is overreach: control spent carelessly turns the same configuration into struggle, because the branch does not yield on its own. Practitioners read this pairing as strongest when the person manages deliberately and weakest when they try to grip everything at once.
Taken together, the 庚寅 day pillar sketches a Geng Yang Metal day master whoseyin ground answers to it. Classical commentary always adds the same caveat: a day pillar is one character pair in a four-pillar chart, and the month branch — the season your chart was born into — can strengthen or exhaust any stem. Treat everything on this page as the first paragraph of the reading, never the whole of it.
The nayin of 庚寅: Pine and Cypress Wood
In the classical sexagenary verse system (nayin), the 庚寅 pillar is Pine and Cypress Wood (松柏木). The nayin system assigns one of thirty poetic images to the sixty pillars two at a time: 庚寅 shares its image with 庚子, its neighbour in the cycle. The image belongs to a different element than the stem itself — nayin is a second, older layer of description laid over the pair.
Traditional commentators used the nayin image to summarise a pillar's texture rather than to compute with it. Pine and Cypress Wood is read as exactly that — an image of how the Geng Yang Metal / yin combination feels from the outside. Treat it as flavour, not as a separate engine.
庚寅 elsewhere in the chart
The 庚寅 pairing does not only appear as a day pillar. The same stem-branch pair can occupy the year, month or hour pillar, and classical reading shifts its role with the seat: in the year pillar it describes the background — family atmosphere, early environment, the generational weather; in the month pillar, the season that sets the whole chart's balance, alongside the world of siblings, peers and career structure; in the hour pillar, the late chapters, children and private ambitions. When the same pair shows up in two seats, commentators read a doubling of its character — the themes above get a larger stage. If 庚寅 appears in your chart at all, it is worth knowing this page even if it is not your day pillar.
Find your own day pillar
Your day pillar comes from your birth date (the day changes at midnight, and in classical practice the hour matters for the other three pillars). The free BaZi calculator on this site computes your four pillars, hidden stems and ten gods locally in your browser, no sign-up needed. If your result shows 庚寅 on the day pillar, this page is you.
Frequently asked questions about the 庚寅 day pillar
It means your day master is Geng Yang Metal (庚) and it sits on the yin(Tiger) branch. The stem describes your core character; the branch describes the ground under it. Their combination (the stem controls the branch) is the first sketch of how you carry that character.
It is the anchor, not the whole picture. Practitioners weight the day stem most heavily because every other element is judged from its position, but the month branch (your season) and the luck pillars tell you when that character gets its chances. Read all four pillars together.
Check the heavenly stem of your birth day. A free chart calculationtakes seconds; if the day pillar reads 庚寅, the description on this page applies to you. Your stem repeats every ten days, but the 庚寅 pairing comes around once in the full sixty-day cycle.
Two answers, both classical. By the stem: the day master is Geng Yang Metal, a Metal day master, and that is the element practitioners count first. By the branch: the yin below it is Wood. In the nayin verse system the pair as a whole counts as Pine and Cypress Wood (松柏木).
Once every sixty days. Days run in an unbroken sexagenary cycle — ten stems cycling against twelve branches, same-polarity pairs only — so each of the 60 pairings, 庚寅 included, falls on one day per full cycle. That fixed rhythm is why a birth date alone pins the day pillar down exactly.
Pine and Cypress Wood (松柏木). The nayin system assigns thirty images to the sixty pillars two at a time, so 庚寅 shares the image with 庚子, the neighbouring pillar in the cycle. It is read as a poetic summary of the pair's texture, not as a separate calculation.