Occultism

Occultism is a catch-all word, and like most catch-all words it hides more than it sorts. It is still worth a closer look, because astrology keeps being filed under it — and historically that is a mistake.

What the word originally meant

Occultus simply means “hidden”. In the natural philosophy of the early modern period, the qualitates occultae were effects that could be observed but not derived from the four elements — a magnet draws iron, and no one could say why.

That was a term from within science, not a term set against it. Hidden meant: not yet explained.

How it turned into a catch-all name

In the nineteenth century that changed. The term became the name of a movement that bundled very different things together: magic, spiritualism, theosophy, tarot, kabbalah in its Western appropriation — and astrology.

That grouping is a decision of the nineteenth century, not a historical fact. Before 1800 astrology was taught at universities, applied in medicine and paid for by courts. It was a subject of calculation, not secret knowledge.

The distinction that matters

The difference is not one of worldview but of method:

Astrology calculates. A planetary position can be checked; two astrologers working from the same birth data arrive at the same chart. They argue about the interpretation, not about the calculation.
Magical practices act. They aim to change something, and their success depends on the person performing them.
Spiritualist practices claim contact with something that is in principle beyond testing.

Only the first rests on a public basis that anyone can recalculate. That does not settle whether interpretation holds — but it is why astrology can be discussed to some purpose and much else cannot.

A practical note

Where astrology is sold alongside magical offers — rituals, amulets, the warding off of misfortune for a fee — caution is in order. Not on grounds of worldview, but because that kind of offer turns up regularly wherever someone is worried and is meant to pay.