Ipchun: Why Your Saju Year Doesn't Start on January 1

What Ipchun actually is

Ipchun (立春) is the first of the 24 solar terms, the moment the sun reaches 315 degrees along its yearly path. Korean almanacs, called manseryeok (만세력), list it to the minute. In 2027 it falls on February 4 at 10:46 a.m. Seoul time, which is 8:46 p.m. on February 3 in New York. Saju counts the year from that moment, so the 2027 Fire Goat (丁未) year starts then, and anyone born between January 1 and that minute is still a Fire Horse (丙午).

Months work the same way

Saju months also start on solar terms, not on the first of the month. The Tiger month begins at Ipchun, the Rabbit month around March 6, the Dragon month around April 5, and so on through the year. Born on March 3? Still a Tiger month. That is why a saju calculator that skips solar terms can give you the wrong month pillar, and sometimes the wrong zodiac animal.

What about your Day Master?

Good news: your Day Master, the soul at the center of your chart, comes from your birth day, and day pillars run in an unbroken sixty-day cycle. Ipchun does not change it. What Ipchun changes is the year and month around it, which shifts the balance of elements in your chart. Our calculator uses the real solar terms, the way a Korean almanac does, so your year, month and day line up.

A tradition worth stealing

On Ipchun, many Korean homes tape a sheet beside the front door reading 立春大吉 建陽多慶: great luck as spring begins, much happiness as the light returns. The old one stays; the new one goes on top. It is a lovely reset button, a few weeks after everyone has already given up on their January plans.

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