TL;DR: Tai Sui is both a mythological concept of a ruling deity each year and linked to Jupiter's nearly 12-year cycle in ancient astrology. Offending Tai Sui occurs when one's zodiac sign clashes with or coincides with the year's Tai Sui position, believed to bring fluctuations and a call for caution.
What is Tai Sui? From Mythology to Astronomy
Tai Sui (太歲) is a familiar concept in Eastern culture, appearing in both Tu Vi (Vietnamese astrology) and Feng Shui. Understanding it requires distinguishing two layers: a mythological one and an astronomical one.
The Mythological Layer: The Deity Ruling Each Year
According to Chinese mythology, each year has a deity who governs and cares for earthly affairs. This deity, called Tai Sui, determines destinies and records people's deeds. This belief serves as a reminder to avoid mistakes and do good deeds.
The lunar year combines 10 Heavenly Stems and 12 Earthly Branches, creating a 60-year cycle with 60 Generals taking turns as Tai Sui. Most were military generals, hence the title Great Generals. Their depicted weapons reflect the year's fortune: a writing brush signals political events, while a sword signals hard work and excellence.
The Astronomical Layer: Connection to Jupiter
The more scientific school links Tai Sui to Jupiter's movement, called the Year Star. Its cycle is nearly 12 years (11.86 years), so 12 zodiac animals were assigned to its positions. When Jupiter entered a zodiac palace, that year was considered strongly influenced.
Since the cycle is not exactly 12 years, calculating Earthly Branches from Jupiter was inconvenient. The ancients conceived an imaginary star moving in a perfect 12-year cycle, opposite the real Year Star, naming it Tai Sui. Over time, it transformed from a fictional star into a supreme deity governing fortune, calamity, longevity, and fate.
How do you determine Tai Sui's position and direction?
In Feng Shui, knowing Tai Sui's position is crucial to avoid disturbing the deity's domain. Feng Shui divides space into 8 main directions, each split into 3 mountains (15 degrees each), totaling 24 mountains on the compass.
Tai Sui's Movement Through Years
Tai Sui moves clockwise through 12 Earthly Branches, one position each year:
| Year | Earthly Branch | Tai Sui Position |
|---|---|---|
| Ren Chen 2012 | Chen | Southeast 1 |
| Gui Si 2013 | Si | Southeast 3 |
| Jia Wu 2014 | Wu | South |
| Yi Wei 2015 | Wei | Southwest 1 |
Years follow the Xia calendar (Chinese agricultural calendar), roughly from February 4 to February 3 of the next year, not the first day of Lunar New Year.
What does "Offending Tai Sui" mean?
Each person is governed by their birth year's zodiac animal. When one's animal conflicts (clash, punishment, harm, break) or coincides with the current year's animal, they are considered to offend Tai Sui.
Common Types of Offending Tai Sui
- Direct Tai Sui: Same zodiac as the current year (e.g., Snake encountering Snake year), called "sitting at the seat."
- Clashing Tai Sui: Zodiac opposite the current year, e.g., Pig clashing Snake.
- Punishing Tai Sui: Zodiac in a three-punishment group with the current year.
- Harming Tai Sui: Zodiac harmed by the current year per six-harm relationships.
- Breaking Tai Sui: Zodiac breaking the current year per break relationships.
Practical Meaning
Traditionally, offenders may face fluctuations in career, finances, health, or relationships. Objectively, this does not guarantee misfortune. It acts as a signal to be cautious with major decisions, monitor health, and avoid unnecessary conflicts.
How is Tai Sui used in Tu Vi and Feng Shui?
In Tu Vi, Tai Sui appears as a star, often residing in the Destiny palace of those born in the ruling year. When Tai Sui enters the Destiny palace, it is considered favorable, but when clashing with bad palaces, it may bring pressure.
In Feng Shui, the year's Tai Sui direction must be respected, avoiding major construction or digging there. The opposite direction (Year Break) also needs care due to clashing energy fields.
Why does "Offending Tai Sui" matter every year?
This concept gains attention annually because it touches universal psychology: everyone wishes for a peaceful, prosperous year. Tai Sui is both a symbol of supreme power (mythology) and a timekeeping tool (astronomy). Together, they create a system with predictive and educational value.
Rather than absolute fear, the ancients viewed offending Tai Sui as an opportunity for self-reflection, moral cultivation, and avoiding negativity. Rituals for appeasement serve to bring mental peace, helping people make wiser decisions.
