太极图的制作原理源于二十四节气观测数据

Construction principle of the Taiji diagram is based on the observation of 24 solar terms

太极图是中国古籍包括中医古籍中颇为多见的古代图式，其制作原理至今无从科学论证，而汉代的一组天文观测记录，蕴藏破释太极图奥秘的关键证据。考察二十四节气昼夜长度的观测数据，发现它的曲线年变化特征，与太极图中的S线形态十分契合，而表述的思想内涵与传统的太极阴阳理念高度一致。研究结论：太极图的制作原理，基于“天道”运动中昼夜阴阳交替的周年变化规律，该规律源于古代二十四节气漏刻观测实践。同时，太极图影响深远，原本是一件重要的中国古代科技作品，应该从学术层面予以重新评估。

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.