Author: Mou ZX.
Affiliation: Meteorological Bureau of Taizhou, Zhejiang, 318000, China.
Conference/Journal: Zhonghua Yi Shi Za Zhi.
Date published: 2011 Jul
Other: Volume ID: 41 , Issue ID: 4 , Pages: 195-9 , Special Notes: [Article in Chinese] , Word Count: 127
The Taiji diagram is a common diagram in ancient Chinese works and medical works, but it's not known yet how it was made. Key evidence has been found in the data of astronomical observation in Han Dynasty. It was found that variation characteristics of the curve of the lengths between days and nights are in accordance with the S-curve of the Taiji diagram. The theory contained in the Taiji diagram could also be illustrated well by this curve. In conclusion: the Taiji diagram was made according to the diurnal rhythm in a year, which was obtained from observation of 24 solar terms in ancient times. As a great scientific achievement in ancient China, the Taiji diagram has profound influence and should be reevaluated on an academic level.