Why the Japanese Astrology Year Begins at Risshun, Not January 1

Two calendars, one country

Japan keeps two new years. The civil one arrives with January 1st — postcards, bells, the first shrine visit. The older one arrives quietly about five weeks later, at 立春 Risshun — the "beginning of spring," almost always February 4th. Risshun is the first of the twenty-four solar terms, 二十四節気 Nijūshi Sekki — the old division of the year by the sun's actual position rather than by the calendar's arithmetic.

Most of modern life follows January. But the traditional arts that read time — including 九星気学 Kyusei Kigaku, Japanese nine-star astrology — follow the sun. In these systems, the year's star changes hands not at midnight on December 31st, but at Risshun.

Why spring, of all moments?

The old solar calendar divides the year by what the light is doing, and Risshun marks the turn from deepest winter toward growth — the moment the year, agriculturally speaking, begins again. For a practice concerned with seasons and temperaments rather than appointments, this is the natural hinge: the year begins when the year begins, not when the paperwork does.

There is something quietly useful in this, even apart from astrology. Early February is when new-year resolutions have usually collapsed; the old calendar suggests that the year was not really underway yet anyway. Risshun offers a second, softer beginning — one that arrives without fireworks and asks for nothing but noticing.

What this means for your birth star

Here is the practical consequence, and it is not small. In Nine Star Ki, your 本命星 Honmei-sei — birth star — is the star of your birth year as the old calendar counts it. If you were born in January, or in the first three days of February, you belong to the star of the previous calendar year.

A January 1990 birth does not carry 1990's star; it carries 1989's. Roughly one person in nine is affected, and most quick lookup tables miss it entirely — which means a meaningful share of the readings people find online begin from the wrong star. If a description of "your star" has never quite fit, this boundary is the first thing worth checking.

Born on the hinge itself

One refinement: the exact moment of Risshun drifts slightly from year to year — sometimes February 3rd, occasionally the 5th. A birth on those dates sits on the hinge itself, and a table cannot settle it alone. If that is you, it may be worth reading both neighboring stars and noticing which temperament you actually recognize.

Checking your own

The free calculator on our front page applies the Risshun rule automatically and flags the boundary dates — under a minute, no email asked. And if you would like to see what the coming fire year may hold for whichever star you turn out to carry, each of the nine has its chapter in the Kyusei Kigaku 2027 Almanac.

The old calendar keeps a gentler truth alongside its arithmetic: beginnings are not appointments. They arrive when the light changes.