BAZI KNOWLEDGE BASE
Why does the BaZi year change at Li Chun? Lunar New Year and zodiac labels
Under the BaZi convention that changes the year at Li Chun (the Start of Spring calendar marker used as the year boundary in many BaZi methods), a birth before that boundary retains the preceding Year Pillar (the two-symbol column for the birth year); the next year begins at Li Chun. Lunar New Year begins a Chinese calendar year, while Li Chun marks a particular solar position. Because these are different events, an everyday zodiac-year label may need to be distinguished from the Year Pillar used in a chart.
Li Chun marks a solar position, not a sudden change in weather
Astronomically, Li Chun corresponds to solar longitude 315°. It usually occurs in early February, but not at one fixed date’s midnight every year. Using it as the BaZi year boundary connects the year count to solar-term (one of 24 seasonal markers defined by the Sun’s position along its yearly path) seasons; it does not mean every location suddenly experiences spring weather.
Actual weather differs by latitude and hemisphere while the astronomical event remains one instant. Its local clock reading depends on the time zone. A personal sense of when spring begins does not determine the pillar.
Lunar New Year, 1 January and Li Chun start different year labels
1 January begins a Gregorian year, Lunar New Year is the first day of the Chinese first month, and Li Chun is a solar-term boundary. For a birth between Lunar New Year and Li Chun, clarify whether an animal label follows the festival calendar or the Year Branch (the lower symbol in the birth-year column) of a Li-Chun-based chart.
A date can belong to the new Chinese calendar year while remaining in the preceding BaZi year, or the reverse. This reflects different purposes for the year labels. It does not require changing the birth date.
A dated example with a time zone: Li Chun in 2026
The Hong Kong Observatory lists Li Chun in 2026 at 04:02 on 4 February, Hong Kong Time. With Hong Kong eight hours ahead of UTC, that is 20:02 on 3 February UTC. The published table gives minute precision, not a specified crossing second.
Using that reference and a Li Chun year boundary, 03:00 Hong Kong Time on 4 February remains in Yi Si, while 05:00 is in Bing Wu. These examples are about an hour from the listed boundary. A record close to 04:02 needs finer astronomical information and birth-time evidence.
Near Li Chun, compare the evidence and calculation precision
Calculators may use an astronomical ephemeris or an approximate solar-position formula. Sharing a definition of the year boundary does not establish equal numerical precision. Check the reference, year and time zone before placing the birth on either side.
Clarify currently uses an approximate solar-position formula for term boundaries. Its numerical result should not be presented as second-by-second agreement with a high-precision ephemeris. Very close births need external astronomical comparison for both year and month.
A Year Pillar is one part of the chart
Li Chun also begins Yin month, so both year and month may change at that boundary. Day and hour have their own calculations. Compare the actual pillars rather than debating only the animal name.
The Year Pillar supplies one layer of traditional interpretation, not a complete life conclusion. Establish the convention and record before reading the four pillars (the chart’s four birth-time columns: year, month, day and hour) together.