2031: Year of the Metal Boar
辛亥
kanoto-i
BoaranimalMetalelementYinpolarity23 January 2031year begins
What a Metal Boar year is read as
Metal produces Water, so in kanoto-i, 辛亥, the stem is read as pouring its hardness into the charge rather than restraining it. The Boar's straight line acquires a point. Tradition treats it as the least reversible of the Boar pairings, since the stem contributes an edge but nothing resembling a turn. Where the pair is faulted is aftermath: force that arrives fully formed and cannot be recalled once released.
The animal repeats every twelve years, the element every ten, so this exact pairing comes round once in sixty. For the animal on its own, see the Boar.
If you were born in January or February
The Chinese zodiac year of the Boar began on 23 January 2031. Anyone born in 2031 before that date belongs to the previous animal, the Dog, in Chinese reckoning.
Japanese eto works differently. Japan moved to the Gregorian calendar in 1873, and the Japanese zodiac year turns on 1 January. So a person born in early 2031 is a Boar in Japan and a Dog by the Chinese calendar. Both answers are correct in their own system, and this is the single most common mistake in online zodiac calculators.
Who the Boar is paired with
Three traditional groupings decide this, and all three are fixed by position in the cycle rather than by anyone’s judgement. The san he 三合 triangle joins every fourth branch: the Boar with the Rabbit and the Goat. The liu he 六合 pairing, sometimes called the secret friend, gives it the Tiger. Directly opposite, six places away, sits the liu chong 六冲 clash: the Snake.
These are relationships between signs, not predictions about people. A clash in the old system means the two branches sit at opposite points of the circle — it is geometry that later acquired a meaning, and Japanese practice leans on it far less than Chinese practice does.
The same year returns every sixty
Ten stems and twelve branches take sixty years to line up again, so 辛亥 is not just a Boar year but this particular one. The others in living memory and in reach: 1971, 2091. A sixtieth birthday returns a person to the stem and branch they were born under, which is why it is marked in Japan as kanreki 還暦 — literally the return of the calendar.
Where 亥 sits in the old system
Before the branches were animals they were coordinates. 亥 marks north-northwest on the compass, the double hour of 21:00-23:00, the 10th month of the old lunisolar calendar, and winter. Its own fixed element is Water, and in the generating cycle the Metal stem of 2031 feeds it — the stem spends itself on the branch.
This is why the old Japanese name for midnight was the hour of the Rat, and why a gate facing north-east is the kimon 鬼門, the demon gate — the directions come from this circle, not from the animals.
2031 in the Japanese calendar
The zodiac is only one of the two year counts a Japanese calendar carries. The other is the era name: what 2031 is in the Japanese calendar, and how to write it on a form.