– The Secret Code of Time That Cycles Every 60 Years
1. Definition of the 60 Jiazi
The 60 Jiazi (六十甲子) is a system of 60 unique combinations created by pairing:
- the 10 Heavenly Stems (Cheon-Gan / 天干), and
- the 12 Earthly Branches (Ji-Ji / 地支).
This cycle repeats every 60 years and forms the core framework of the traditional East Asian time-keeping system.
2. Components of the Jiazi System
🔟 Heavenly Stems (10)
Gap (甲), Eul (乙), Byeong (丙), Jeong (丁), Mu (戊),
Gi (己), Gyeong (庚), Sin (辛), Im (壬), Gye (癸)
🕛 Earthly Branches (12)
Ja (子), Chuk (丑), In (寅), Myo (卯), Jin (辰), Sa (巳),
O (午), Mi (未), Sin (申), Yu (酉), Sul (戌), Hae (亥)
3. How the 60 Combinations Are Formed
By matching the 10 Stems and 12 Branches in sequence,
we get 60 unique Gan-Ji combinations.
Examples:
- Gap-Ja (甲子)
- Eul-Chuk (乙丑)
- Byeong-In (丙寅)
- … up to Gye-Hae (癸亥)
After that, the cycle begins again with Gap-Ja — a perfect loop.
4. The 60-Year Cycle
The smallest common multiple of 10 (Stems) and 12 (Branches) is 60,
so the same Jiazi combination recurs every 60 years.
For example:
- 2004 was Gap-Sin (甲申) Year
- 2064 will again be Gap-Sin (甲申)
5. Cultural Significance of the 60 Jiazi
🎂 1) Hwangap (還甲 / Return of the Jiazi)
When a person turns 60, they return to the same Jiazi as their birth year.
This is celebrated as Hwangap, meaning “the return to Gap-Ja” —
a symbolic rebirth, marked with a traditional feast.
🏛 2) History and Chronology
During King Sejong’s reign, the Chiljeongsan (七政算) — a royal astronomical calendar —
used Gap-Ja year as its base for calculating time.
Later, in Joseon Dynasty historical records, including the Annals of the Joseon Dynasty,
the 60 Jiazi system became the official chronological tool for year marking.
Each historical event was recorded with its respective Jiazi year.
6. How to Calculate the Jiazi Year
| Step | Description |
|---|---|
| Set a Base Year | e.g., 1444 was a Gap-Ja (甲子) year |
| Subtract 4 | e.g., 1592 → 1592 − 4 = 1588 |
| Divide and Find Remainders |
- 1588 ÷ 10 → remainder 8 → Stem = Im (壬)
- 1588 ÷ 12 → remainder 4 → Branch = Jin (辰)
→ So, 1592 = Im-Jin (壬辰) Year
🔚 Conclusion – Time Doesn’t Move Forward, It Cycles
The 60 Jiazi is more than a numeric system.
It reflects the Eastern view of time — not linear, but cyclical.
Through the 60 Jiazi, we see how a person’s destiny contains
both the repetition of patterns and the possibility of renewal.
🤖 A Note from Dr. Meng Tengu-ri
“Western time moves like a line.
Eastern time moves like a circle.The 60 Jiazi is not just a calendar —
it’s a system for remembering time,
and a philosophy of how human life cycles with nature.The path you walk today…
someone else may walk it again — 60 years from now. :)”
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