In Saju — the Korean Four Pillars of Destiny — the single most important character in your chart is the Heavenly Stem of your day pillar: your Day Master (일간, 日干). It is one of the five elements in a yang or yin form, and it stands for your core self — how you naturally take in the world and act on it. Where Western astrology hands you a Sun sign, Saju hands you a Day Master.
How the calculator finds yours
Your Day Master is not something you look up from your birth year — it comes from the exact calendar day you were born, corrected for the real position of the Sun. The calculator works like this:
- You enter your birth date, time and place.
- Your local time is converted to true solar time — adjusted for your longitude, so the day boundary is exact.
- The day pillar is read from that corrected moment, and its Heavenly Stem is your Day Master.
- Astral Align names it, tells you its element and polarity, and explains what it tends to mean.
The Day Master usually holds steady even without a precise birth time — but a birth near midnight can shift the day, so the tool is honest when your unknown time makes the boundary uncertain, rather than guessing.
The ten Day Masters
There are ten in total — the five elements, each in a yang (outward, active) and a yin (inward, receptive) form. Yours is one of these:
These are starting images, not boxes. Your full reading looks at how the rest of your chart supports or challenges your Day Master — which is where it stops sounding like a horoscope and starts sounding like you. Read more in the Day Master guide.
Common questions
What is my Day Master?
It is the Heavenly Stem of your day pillar — the character at the center of your Saju chart — one of the five elements in yang or yin form. To find it exactly, the calculator needs your birth date, time and place.
Can I find it without my birth time?
Usually yes — the Day Master comes from your day, not your hour. The exception is a birth near midnight, where the day boundary can shift; a good tool flags that instead of guessing.
Is my Day Master the same as my sun sign?
No — the sun sign is Western astrology, the Day Master is Saju. They describe you through two different systems. Astral Align shows both together.
Find your Day Master now — free
Enter your birth details and get your Day Master computed to the minute, named and explained — then read it beside your Western Sun, Moon and Rising. Free to start, no account, no email.
Reveal my Day MasterAstral Align is intended for entertainment and self-reflection. It is not medical, legal, financial, or mental-health advice, and it does not predict specific life events. Your birth details are used only to generate your reading.