Reply #15: Alchemy is different.

[Lionel Mandrake]

What happened to alchemy was that it slowly transformed itself into modern chemistry. There is no such continuity for astrology. In the early seventeenth century, there was general dissatisfaction with astrology and an attempt to purify it, i.e., to extract what was worthwhile and throw away the rest. Such attempts failed.

Isaac Newton wore many hats. He was an alchemist, a unitarian interested in biblical chronology, and master of the London Mint, as well as what we would now call a mathematician and physicist. But he had the good sense to avoid astrology.