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?

1 Answer 1


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 :)


have fun :)

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.