Was there a teacher of Yin and Yang in ancient China?

Japanese "Yin-Yang Daoism" originated from the theory of Yin-Yang and Five Elements in China's contention period. During the Warring States period, there was a school that advocated the theory of Yin-Yang and Five Elements, which was called "Yin-Yang School". At that time, Zou Yan and Zou Shuang of Qi were the main representatives. By studying the theory of Yin-Yang and Five Elements, we can draw up a calendar from the calculation of celestial movement and master everything in the world.

Qin is different. It is official signing, observing the astronomical phenomena, calculating solar terms and making calendars.

So the difference between the two is that one is individual standard and the other is collective unit.