二十四节气是中国古代发明的，为什么用的公历时间
浑天仪、地动仪、圆周率、灌钢法、冶铁术、中医、针灸、园林建筑、齐民要术等等等
中国古代的创造发明
The compass is one of the four great inventions of ancient China, the development of the science and technology and the invention of human civilization, plays an immeasurable role. In ancient Chinese compass, initially used inritual, ceremonial, military and divination and geomancy to determine azimuth. At the end of Eleventh Century or early twelfth Century, the ship began to use the compass navigation China. The Northern Song Dynasty, Ping: onthe boat (helm) knowledge of geography, night stargazing, day day, dark view compass.
我国的古代发明
火药 指南针 造纸 印刷术 地动仪
