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They observed the sky and created a calendar and so instructed the peasant people when to undertake their agricultural works. The imperial bibliography Yiwenzhi 藝文志 of the official dynastic history Hanshu 漢書 says that the Yin-Yang thinkers originated in astromical and astrological offices that were in mythological times occupied by Xi He 羲和. They had nevertheless made, he admitted, important contributions to the understanding of the astronomical phenomena and the annual seasons and the seasonal phaenology. The oldest description of the Yin and Yang school has been made by the Former Han period 前漢 (206 BCE-8 CE) historiographer Sima Tan 司馬談 who said in his essay Lun liujia yaozhi 論六家要旨 that the diviners of the Yin and Yang school tried to enchain and intimidate the stupid masses with their statements ( shi ren ju er duo wei 使人拘而多畏). The Yin and Yang school originated among the ancient astronomers that observed sun, moon and the constellations and also tried to predict the future from the movements of the starry sky. It is often mentioned side by side with the school of the Five Agents ( yinyang wuxing jia 陰陽五行家). The school of Yin 陰 and Yang 陽 thought was one of the philosophical schools of the Warring States period 戰國 (5th cent.-221 BCE).