Why does a calendar say Beginning of Spring on February 4 when the air still feels like winter? Lichun is not a weather forecast. It is one of 24 points defined by the Sun’s position. Those points help organize a lunisolar calendar: lunar months and solar seasons share the same system. Here is how the terms work, which 2026 dates to check, and why two calendars can show different days for the same event.
What a solar term measures
As seen from Earth, the Sun appears to move along the ecliptic during the year. The Hong Kong Observatory divides that apparent path into 24 equal steps of 15 degrees of solar longitude. Lichun (立春, Beginning of Spring) starts when the Sun reaches 315°. Chunfen (春分, Spring Equinox) is 0°; Qingming (清明) follows at 15°. A term is a boundary moment, not a fixed Gregorian date or a prediction that the weather changes on that day.
The term dates stay near the same part of the Gregorian year because they follow the Sun, but they are not permanently fixed to one calendar day. The instant can fall on a different date in different time zones. The intervals are roughly two weeks, not 15 identical 24-hour blocks.
This is why “solar or lunar?” needs a careful answer. The terms are solar-defined, but they belong to the traditional Chinese lunisolar calendar. The lunar months track the Moon; solar terms keep the calendar connected to the seasons. HKO classifies the 24 as 12 major terms and 12 minor terms, alternating. Major terms also matter in the calendar’s leap-month rule. Describing our eight hand-picked dates as an official major-term category would confuse them with that 12-term classification.
Why divide the year into 24 parts?
UNESCO’s description of the Twenty-Four Solar Terms traces the system to China’s Yellow River region and describes its use in agriculture and daily routines. Four seasons are a broad frame; a new name every roughly 15 days offers a finer way to talk about the changing year.
The names reflect observations and practices from that history. Grain Rain and Frost Descent are evocative, but neither can promise rain or frost at your address. Local climate differs, and so does weather from year to year. The useful distinction is between an astronomical marker, which can be calculated, and a local seasonal condition, which cannot be read from the term name alone.
The traditional cycle starts with Lichun and finishes with Greater Cold. A January-to-December table begins instead with Lesser Cold and Greater Cold from the cycle already in progress; the order is a presentation choice, not a different astronomical system.
Eight seasonal landmarks in 2026
The table picks the four “Beginning” terms and the two equinoxes and two solstices as a readable set of landmarks. It is not the official list of major solar terms. Dates below come from the National Astronomical Observatory of Japan’s 2026 Calendar Outline and use Japan Standard Time (UTC+9).
| Landmark | 2026 date in Japan |
|---|---|
| Lichun (立春), Beginning of Spring | February 4 |
| Chunfen (春分), Spring Equinox | March 20 |
| Lixia (立夏), Beginning of Summer | May 5 |
| Xiazhi (夏至), Summer Solstice | June 21 |
| Liqiu (立秋), Beginning of Autumn | August 7 |
| Qiufen (秋分), Autumn Equinox | September 23 |
| Lidong (立冬), Beginning of Winter | November 7 |
| Dongzhi (冬至), Winter Solstice | December 22 |
NAOJ published that 2026 outline on February 3, 2025; its table supplies times to the minute. These eight dates are a quick seasonal map, not a substitute for checking all 24 entries when you need a specific term. Qingming, for example, is the fifth term in the Lichun-first sequence and begins on April 5 in NAOJ’s 2026 Japan-time table.
Why “Beginning of Spring” can still be cold
Lichun is the Sun at 315°, not a thermometer crossing a threshold. The land, ocean, snow cover and weather patterns do not have to respond instantly to the amount of sunlight. The coldest part of the year can fall after the winter solstice, but not at one universal interval everywhere. NOAA’s climate normals show substantial regional differences even within the United States.
So “Beginning of Spring” names a place in the annual solar cycle. It does not certify that winter conditions have ended where you live. The same caution applies to Beginning of Autumn in August: the calendar marker is precise; the day’s temperature is local.
Same instant, different calendar date
Time zone matters most when a term begins near midnight. NAOJ lists Mangzhong (Grain in Ear) at 00:48 on June 6, 2026 in Japan (UTC+9). Subtract one hour for Hong Kong/China time (UTC+8) and the same instant is 23:48 on June 5. The Hong Kong Observatory’s time-service definition identifies Hong Kong Standard Time as UTC+8. The one-hour conversion here is calculated from NAOJ’s stated Japan-time instant, not copied as a separate US-local event. A date copied without its time zone can therefore be one day off for another audience.
The English PiPi Worlds lunar calendar tool uses a Chinese-calendar basis, not a US-local observatory ephemeris. In the tool’s English market, enter May 19, 2026 and the next term is Xiaoman (labeled “Lesser Full Grain”) on May 21, D-2. Enter June 3, 2026 and it shows Mangzhong on June 5, D-2. The June result is not NAOJ’s June 6 Japan-time calendar date, although both refer to the same term. These examples are checked against the site’s calculation code; they are not a claim that the site uses an observatory’s algorithm or supplies official event times.
For an important ceremony or a location-specific date, use an authority that states its time zone. HKO explains the 24-term system and publishes solar-term times in Hong Kong time; NAOJ’s outline uses Japan time. Treat the site’s date-only next-term result as a planning aid, not a replacement for either almanac.
Cultural dates and one zodiac caveat
The terms also sit beside observances, but the customs are not identical across countries. NAOJ lists Setsubun on February 3, 2026, the day before Lichun; the Government of Japan describes bean throwing as one custom. In Korea, Dongji names the winter solstice; the Korea Tourism Organization describes eating red bean porridge, patjuk, for the occasion. In China, Qingming is both the fifth solar term and a festival associated with tomb sweeping and remembrance.
A solar-term date alone also does not establish a universal zodiac-year boundary. Different calendrical or astrological conventions can use different year boundaries. This site’s English converter shows its year stem-branch and animal from the converted Chinese lunar year; it does not show a separate Lichun-based year. For a birthday near a year boundary, say which convention you mean rather than treating one label as universal.
Find the next solar term for your date
A landmark table is useful for orientation; a date-specific answer is more practical. Enter a Gregorian date in the English lunar calendar tool to see the next term, its displayed date and the number of calendar days remaining, alongside the converted lunar date. The tool accepts years 1900–2099 and uses Chinese-calendar data for this English view. If a one-day difference would matter, compare the relevant official almanac and its time zone before making plans.