I have never heard and read that VEDAS has mentioned anything about astrology. Why we call astrology as Vedic Astrology. Its a Science and i believe in this but why we are calling it Vedic Astrology , its not derived from VEDAS.
Vedic astrology is based upon Vedas. The greatest of the ancient sages rishi Vaishta, who is famous sage of the Rig Veda, it is to his grandson Parashara to whom the origin of Vedic astrology can be traced. His work also known as Brihat Parashara Hora Shastra are still the main book or scripture on this subject.