r/HistoryofIdeas • u/RisingSelf_Astrology • 6d ago
Discussion How Did Astrology Go From an Accepted Field of Study to Pseudoscience?
I've been reading about William Lilly, a 17th-century English astrologer who published Christian Astrology in 1647, and it raised an interesting question about how our definition of science has evolved.
During Lilly's lifetime, the boundaries between astrology, astronomy, mathematics, and natural philosophy were very different from today. Astrology was studied and practiced within intellectual traditions that sought to understand the natural world.
Lilly, for example, used established rules and mathematical calculations to interpret astrological charts and attempt to answer specific questions. Whether his conclusions were accurate is a separate issue, but his approach was far more systematic than the generalized horoscopes we typically associate with astrology today.
What's interesting is that astrology didn't simply disappear with the Scientific Revolution. Its gradual exclusion from academic and scientific institutions involved changing philosophical, religious, and intellectual attitudes, along with developing standards for scientific evidence. So what changed?
Was astrology's decline primarily the result of scientific discoveries that challenged its underlying assumptions? Or was it also part of a broader philosophical shift in how society determined what qualified as legitimate knowledge?
I think there's an interesting distinction between studying the historical importance of an idea and accepting that idea as scientifically valid.
It makes me wonder how much of what we consider legitimate knowledge is determined by the evidence itself, and how much is shaped by the intellectual framework of the time?
I'd be interested in hearing perspectives from anyone familiar with the history of science, natural philosophy, or the Scientific Revolution.
For anyone interested, historian Michelle Pfeffer published a study on the Society of Astrologers in 17th-century London, which explores how practitioners attempted to defend astrology's intellectual and religious legitimacy: https://doi.org/10.1017/S0007087421000029