Is Astrology Shirk
Superstitions that human beings become target of are of polytheistic genre. Thus the Prophet (sws) has warned people about them. He has also preventively stopped people from certain things which though do not fall in the ambit of polytheism are liable to lead to it like astrology resulting in belief in stars etc. Please refer to the following lecture for details: https://youtu.be/s5etJdXeHfw