<p>before 清 dynasty (1644-1911), the calendar system in china used 平氣, solar terms lasts 15 days+ (it's roughly 365.25 days / 24).</p>

<p>then, the 時憲曆 changed the method to 定氣, that 360° div 24 = 15°, upon people observation, when the sun "walks" 15° on zodiac, solar term changes.</p>

<p>so, your question would be answered, it depends on which dynasty, and / or which seasons. eg, in 2018:</p>

<p>the 夏至 (summer solstice) is on 21st june, the 小暑 (lesser heat) is on 7th july. so, the summer solstice lasts 16 days :)</p>

<p><a href="http://www.weather.gov.hk/gts/astron2018/Solar_Term_2018_uc.htm" rel="noreferrer">http://www.weather.gov.hk/gts/astron2018/Solar_Term_2018_uc.htm</a></p>

<p>have fun :)</p>

CC BY-SA 3.0
2018-04-13T19:01:08.657Z
2018-04-13T19:01:08.657Z
水巷孑蠻
<p>People usually say there are 24 Solar Terms (24节气) in a year, and each lasts 15 days. If so, 24x15 days = 360 days.</p>
<p>But a year has at least 365 days. Does it mean some 节气 have more than 15 days?</p>

<culture><calendar>
How many days does a 节气 last for?
# How many days does a 节气 last for?

(Asked by: username_0 on 2018-04-13)

People usually say there are 24 Solar Terms (24节气) in a year, and each lasts 15 days. If so, 24x15 days = 360 days.

But a year has at least 365 days. Does it mean some 节气 have more than 15 days?

**Tags:** culture, calendar

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## 1 answers

### Answer by username_1 on 2018-04-13. Score: 7 | Accepted answer

before 清 dynasty (1644-1911), the calendar system in china used 平氣, solar terms lasts 15 days+ (it's roughly 365.25 days / 24).

then, the 時憲曆 changed the method to 定氣, that 360° div 24 = 15°, upon people observation, when the sun "walks" 15° on zodiac, solar term changes.

so, your question would be answered, it depends on which dynasty, and / or which seasons. eg, in 2018:

the 夏至 (summer solstice) is on 21st june, the 小暑 (lesser heat) is on 7th july. so, the summer solstice lasts 16 days :)

<http://www.weather.gov.hk/gts/astron2018/Solar_Term_2018_uc.htm>

have fun :)


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