Your zodiac animal can change on one of three dates, depending on who you ask. Saju (사주 四柱, Korean four-pillar reading) switches the year at Ipchun (입춘 立春, “start of spring”), around February 4. Everyday lunar custom switches at the Lunar New Year, called Seollal (설날) in Korea. Casual talk sometimes just uses January 1.
If you were born between January 1 and mid-February, the rule you use may change your animal. Outside that window, all three usually agree.
Here is where each date comes from, why saju picks Ipchun, and how to check your own birthday.
Three calendars, three new years
| New year | Calendar | Date | Used for |
|---|---|---|---|
| January 1 | Gregorian (solar, civil) | Fixed | Casual talk, some apps and horoscopes |
| Seollal / Lunar New Year | Lunisolar | Moves, between late January and mid-February | Holidays, family custom, many everyday zodiac chats |
| Ipchun | Solar terms | Around February 4 | Saju year pillar and month pillar |
January 1 is the civil new year. It is simple, and some people use it for their animal just because it is easy.
Seollal follows the lunisolar calendar. The Chinese-style calendar puts the new year on a new moon between about January 21 and February 20. Korean references describe Seollal as usually the second new moon after the winter solstice. That is why its date moves each year.
Ipchun is one of the 24 solar terms (절기 jeolgi 節氣). These mark points in the sun’s yearly path, not the moon’s. Ipchun is the first of them, the traditional start of spring. The 24 solar terms were added to UNESCO’s Representative List of the Intangible Cultural Heritage of Humanity in 2016.
Why saju uses Ipchun
A saju chart has four pillars: year, month, day and hour. The year and month pillars follow the sun, not the moon. Months in saju begin at twelve “jeol” solar terms, and Ipchun is the first. It opens the 寅 (in, Tiger) month and the new year pillar at the same moment.
So in a chart, “the new year” means the sun has reached the start of spring. It does not mean the new moon has appeared. A lunar holiday and a solar chart are measuring two different things, so their new years fall on different days.
Everyday Korean zodiac talk grew up around the holiday, so many people naturally use Seollal. Both habits are real parts of Korean culture. Neither one is “wrong.”
Worked examples: 2026 and 2027
2026 is 丙午 byeong-o, a Fire Horse year. 2025 was 乙巳, a Snake year. 2027 is 丁未 jeong-mi, a Fire Goat year.
Key dates:
- 2026: Ipchun around February 4. Seollal on Tuesday, February 17.
- 2027: Ipchun around February 4. Chinese New Year on Saturday, February 6. Korean Seollal on Sunday, February 7.
| Birth date | By Jan 1 | By Ipchun (saju) | By Seollal |
|---|---|---|---|
| January 20, 2026 | Horse | Snake | Snake |
| February 10, 2026 | Horse | Horse | Snake |
| February 20, 2026 | Horse | Horse | Horse |
| February 3, 2027 | Goat | Horse | Horse |
| February 5, 2027 | Goat | Goat | Horse |
The February 10, 2026 baby is the classic case. Their saju year pillar is already the Fire Horse, but at a family Seollal lunch someone may still call them a Snake. Both are telling the truth about a different calendar.
A 2027 quirk: why Korea and China differ by a day
In 2027 the new moon that starts the lunar year falls at 23:57 on February 6, China time. In Korea, one hour ahead, that is 00:57 on February 7. The lunar month starts on the day the new moon happens in local time. So Chinese New Year lands on Saturday the 6th and Korean Seollal on Sunday the 7th.
It is a small reminder that “Lunar New Year” depends on where you stand. It does not affect saju years at all, because Ipchun follows the sun.
If you were born close to Ipchun
Ipchun is not just a date. It is an exact moment, and that moment moves a little each year. It can land on February 3, 4 or 5, at any hour. If you were born within a day or so of it, two details matter:
- Your birth time. A baby born a few hours before Ipchun has the old year pillar. A baby born a few hours after has the new one. This is one reason practitioners ask for the birth hour.
- Your time zone and clock history. South Korea’s standard time has changed over the years. It was UTC+8:30 from 1954 to 1961, and daylight saving time was used in some years, including 1987–88 around the Seoul Olympics. Many practitioners also adjust for true solar time. Seoul sits near 127°E, about 32 minutes behind the 135°E meridian used for UTC+9.
For the exact Ipchun moment in a given year, practitioners check an astronomical almanac, such as the lunar calendar service run by the Korea Astronomy and Space Science Institute (KASI).
If you do not know your birth time, you can still read three pillars (six characters). But for a birthday right on the Ipchun line, the year pillar may stay uncertain.
Which one should you use?
- Reading a saju chart: use Ipchun. The year pillar, month pillar and luck cycles are all built on solar terms.
- Chatting at a Korean family gathering: go with the flow. Many people use Seollal, and some use January 1.
- Filling in a zodiac quiz or app: check its rule. Western-facing zodiac content often uses the Lunar New Year.
FAQ
When does the zodiac year start in saju?
In saju the year starts at Ipchun, the “start of spring” solar term, around February 4. The exact moment moves slightly from year to year and can fall on February 3, 4 or 5. The year pillar and the first month pillar both change at that moment, so a baby born just before Ipchun keeps the previous year’s animal in their chart.
I was born in late January. What is my animal?
In most years, a late-January birthday comes before Ipchun, so in saju you belong to the previous year’s animal. Under the Seollal rule the answer depends on that year’s Lunar New Year date, which moves between late January and mid-February. Under the January 1 rule you take the new year’s animal. Check the specific year’s dates to be sure.
Is it wrong to use the Lunar New Year for my zodiac animal?
No. Using Seollal is a real and widespread custom. It ties your animal to the holiday calendar that Korean families celebrate. Saju simply follows a different, solar rule for building charts. The two answer different questions, so both can be right in their own context. Just know which rule a reading or app is using.
Why do Korea and China celebrate Lunar New Year on different days in 2027?
The new moon that begins the lunar year happens at 23:57 on February 6, 2027, China time. That is already 00:57 on February 7 in Korea. Because the new month starts on the local date of the new moon, Chinese New Year falls on February 6 and Korean Seollal on February 7.
Try it with the Moon Rabbit
Born near a boundary? The Moon Rabbit’s free saju card builds your chart on the Ipchun rule and takes about 30 seconds. To see each pillar and the solar-term logic behind it, open the pro manseryeok chart.
Saju is a cultural tradition, not a science. SajuBunny readings are for fun and self-reflection, not professional advice.
Sources
- https://en.wikipedia.org/wiki/Solar_term
- https://ich.unesco.org/en/RL/the-twenty-four-solar-terms-knowledge-in-china-of-time-and-practices-developed-through-observation-of-the-sun-s-annual-motion-00647
- https://en.wikipedia.org/wiki/Chinese_calendar
- https://en.wikipedia.org/wiki/Korean_calendar
- https://en.wikipedia.org/wiki/Seollal
- https://en.wikipedia.org/wiki/Time_in_South_Korea
- https://astro.kasi.re.kr/life/pageView/8
- https://www.chinesefortunecalendar.com/2027.htm
- https://calendarhours.com/lunar-new-year/
- https://publicholidays.co.kr/seollal/
- https://en.wikipedia.org/wiki/Four_Pillars_of_Destiny