Astrology and astronomy were archaically treated together, and were only gradually separated in Western 17th century philosophy (the " Age of Reason ") with the rejection of astrology. During the later part of the medieval period, astronomy was treated as the foundation upon which astrology could operate. Since the 18th century they have come to be regarded as completely separate disciplines.
Astronomy, the study of objects and phenomena originating beyond the Earth's atmosphere, is a science and is a widely studied academic discipline. Astrology, which uses the apparent positions of celestial objects as the basis for the prediction of future events, is a form of divination and a pseudoscience having no scientific validity.