Did the Yin and Yang Family really exist in the Qin Dynasty?

Yin and Yang were still active in the Qin Dynasty. After the establishment of the Qin Dynasty, the theory of "Five Virtues at the End" of Yin and Yang Family was adopted, and it was established that the Qin Dynasty belonged to water virtue, and the dress color was still black. In the Qin Dynasty, Zhang Cang was the representative of Yin and Yang. He studied under Xunzi, a Confucian master at the end of the Warring States Period, and was as famous as Li Si, Han Fei and Fu. Zhang Cang, a post-official of the Qin Dynasty, later fled back to his hometown of Wu Yang because of his crime. When Emperor Gaozu Liu Bang's army passed through Wu Yang, Zhang Cang joined Liu Bang's army and became a general under Liu Bang. During the Chu-Han War, as a ministry of Han Xin, it attacked Zhao and Dai. After Han Xin was appointed, Zhang Cang appointed Dai Jun as the satrap to guard against the Huns' attack. After the establishment of the Han Dynasty, he became a calculator because he was proficient in the calculation of the lunar calendar, and served as the deputy of Prime Minister Xiao He in the Prime Minister's Office. During the Hui Di period, it was the Huainan phase. At the end of Lv Hou's reign, he was transferred back to the central government as an imperial doctor. After Lv Hou's death, Zhang Cang participated in the coup of Heroes, killed Lu's consort, and established Emperor Wen of Chinese. In the fourth year of Emperor Wendi, the Prime Minister Guan Ying died and Zhang Cang succeeded him. Zhang Cang was a rare scholar who made great contributions to the founding of the People's Republic of China in the early Han Dynasty. For Confucianism, he participated in the biography of Zuo Shi in the Spring and Autumn Period; For the Yin and Yang family, he is proficient in calendar calculation and has compiled nine chapters of arithmetic. His book "Zhang Cang" is the masterpiece of Yin and Yang, which has been lost.