Taoism stresses the unification of nature and human

Taoism predict the future	Taoism predict the future

Taoism stresses the unification of nature and human, and pays much attention to astronomical calendar.
In the Sui and Tang dynasties (581-907), many Taoists participated in making astronomical calendar. In the Sui Dynasty (581-618), Taoist Zhang Bin organized the establishment of Kaihuangli (opening the almanac); meanwhile, he wrote a book of 5 volumes concerning the astronomical calendar. In the reign of Tang Emperor Gaozu (the first emperor of Tang Dynasty, reigning in 618-627), Taoist Xue Yi, based on his astrological observations, marked that it was the time for Li Shimin, the king of Qin, to be the emperor. After Li Shimin (the second emperor of the Tang Dynasty, reigning in 627-650) became the emperor, he set up Zifu Temple (purple house), and appointed Xue Yi as the abbot. Meanwhile, a balcony was built in Zifu Temple to observe astronomical phenomena. The forecast made by Xue Yi is quite similar to what is provided by today's national astronomical observatory.
Of course the purpose for Taoists to observe astronomical phenomena and prognosticate seasonal changes is to achieve juvenescence and longevity. Nevertheless, it objectively contributed a lot to the development of ancient Chinese astronomical calendar.