Is the Book of Changes used for divination?

Yes, at first, and its biggest use is astrology, that is, divination. There are many cases of divination with Zhouyi in Zuozhuan and Guoyu, which are called divination cases. There are many tools for divination, such as straw, tortoise shell and coins. In modern times, due to the prosperity of science, people mainly discussed Zhouyi in the field of philosophy, but representatives like Liu Dajun insisted on studying Zhouyi from the perspective of physiognomy.