Science of today is not science of the past. Science has changed and evolved over time. Prior to the Renaissance, western astrology fit in well with the sciences of the day. Generally speaking, astrology was indistinguishable from astronomy, and was closely allied with medicine. Astrology and science began to diverge with the Copernican Revolution, and continued with advances in medicine that were made without reference to medical astrology. Astrology could easily be considered a science in ancient times back when Aristotle was in vogue, but today science (as geophysics or molecular biology) is simply the wrong category of comparison.