---
title: "Astrology — AP Euro Definition & Scientific Revolution"
description: "Astrology is the practice of reading the stars to predict human events. In AP Euro, it shows how old beliefs survived alongside new science like Kepler's astronomy."
canonical: "https://fiveable.me/ap-euro/key-terms/astrology"
type: "key-term"
subject: "AP European History"
unit: "Unit 4"
---

# Astrology — AP Euro Definition & Scientific Revolution

## Definition

In AP Euro, astrology is the traditional practice of interpreting the movements of celestial bodies to predict earthly events, and it matters because it persisted alongside the new astronomy of the Scientific Revolution, with figures like Kepler practicing both at once.

## What It Is

Astrology is the old belief that the positions and movements of stars and planets influence human affairs, so reading the sky can tell you about wars, harvests, illnesses, and a king's fortune. For centuries it was treated as serious knowledge. [Universities](/ap-euro/key-terms/universities "fv-autolink") taught it, physicians used it to time treatments, and rulers paid court astrologers to cast horoscopes before making big decisions.

Here's the part [AP Euro](/ap-euro "fv-autolink") cares about. Astrology didn't vanish when Copernicus, Galileo, and Newton built a new heliocentric, mathematical picture of the cosmos (KC-1.1.IV.A). It coexisted with the new science, sometimes inside the same person. Johannes Kepler, who discovered the laws of planetary motion, also cast horoscopes for nobles and genuinely believed the heavens shaped human life. So astrology is your go-to example that [the Scientific Revolution](/ap-euro/unit-4/scientific-revolution/study-guide/TlVIEQWOBdTIF1JSwCTH "fv-autolink") was not a clean break where 'superstition' died overnight. Old and new ways of understanding nature overlapped for a long time.

## Why It Matters

Astrology lives in Topic 4.2, The Scientific Revolution, in [Unit 4](/ap-euro/unit-4 "fv-autolink") (Scientific, Philosophical, and Political Developments). It supports learning objective 4.2.A, which asks you to explain how understanding of the [natural world](/ap-euro/key-terms/natural-world "fv-autolink") developed and changed. The trick is the word 'changed.' The CED wants you to see both the new methods (heliocentrism, experimentation, inductive and deductive reasoning) and the stubborn continuities. Astrology, like alchemy, is the classic continuity. Newton did alchemy, Kepler did astrology, and 17th-century elites kept consulting the stars even as natural philosophy got more mathematical. On the exam, this is exactly the kind of nuance that separates a basic answer ('science replaced superstition') from a sophisticated one ('new science and traditional beliefs coexisted, often in the same minds').

## Connections

### [Alchemy (Unit 4)](/ap-euro/key-terms/alchemy)

[Alchemy](/ap-euro/key-terms/alchemy "fv-autolink") is astrology's twin in AP Euro. Both are traditional practices that survived the Scientific Revolution, and both were practiced by genuine scientific giants. Kepler did astrology, Newton did alchemy. Pair them whenever a question asks about continuity in this period.

### [Copernican hypothesis (Unit 4)](/ap-euro/key-terms/copernican-hypothesis)

Heliocentrism rearranged the cosmos, but it didn't kill astrology. [Kepler](/ap-euro/key-terms/kepler "fv-autolink") used Copernicus's sun-centered model to make his planetary laws and still cast horoscopes. New cosmology and old star-reading ran on parallel tracks for decades.

### [Aristotelian cosmology (Unit 4)](/ap-euro/key-terms/aristotelian-cosmology)

Traditional astrology fit neatly inside the old Aristotelian picture, where the heavens were perfect and naturally influenced the imperfect Earth below. As that cosmology crumbled under [Galileo](/ap-euro/key-terms/galileo "fv-autolink")'s telescope, astrology lost its theoretical foundation, even though the practice hung on.

### [Deductive Reasoning (Unit 4)](/ap-euro/key-terms/deductive-reasoning)

Bacon and Descartes pushed experimentation and rigorous reasoning as the path to truth (KC-1.1.IV.C). Astrology is the contrast case. It rested on ancient authority and analogy rather than testable evidence, which is why it slowly slid from respected science to fringe belief by the 18th century.

## On the AP Exam

Astrology shows up in multiple-choice questions about intellectual continuity during the Scientific Revolution. Typical stems ask what the continued popularity of astrology among 17th-century elites demonstrates, or which part of Kepler's career reflects his astrological beliefs. The answer almost always points to coexistence, meaning traditional beliefs persisted alongside new scientific methods. No released FRQ has used the term verbatim, but it's strong evidence for LEQ and DBQ prompts on change and continuity in European thought. If you're arguing the Scientific Revolution was a gradual transition rather than a sudden break, Kepler casting horoscopes while writing his laws of planetary motion is one of the best single pieces of evidence you can drop.

## astrology vs Astronomy

Astronomy is the scientific study of celestial bodies using observation and math, and it's what Copernicus, Galileo, and Newton revolutionized. Astrology claims those celestial bodies predict human events. In the 1500s the two were tangled together (the same person often did both), but the Scientific Revolution slowly pulled them apart. By the Enlightenment, astronomy was science and astrology was not. On the exam, astronomy is the 'change' and astrology is the 'continuity.'

## Key Takeaways

- Astrology is the practice of interpreting the stars and planets to predict human events, and it remained popular through the Scientific Revolution.
- Johannes Kepler is the go-to example, since he discovered the laws of planetary motion and also cast horoscopes for nobles he genuinely believed in.
- Astrology proves the Scientific Revolution was a gradual transition, not a sudden replacement of old beliefs with new science.
- Pair astrology with alchemy (Newton's hobby) as your two best examples of intellectual continuity for LO 4.2.A.
- Astronomy and astrology were intertwined in the 1500s but split apart as scientific methods like experimentation and mathematical proof took over.
- Even educated 17th-century elites consulted astrologers, which shows that new science spread slowly and unevenly across European society.

## FAQs

### What is astrology in AP Euro?

It's the traditional practice of reading the movements of celestial bodies to predict earthly events, like wars, illness, or a ruler's fate. AP Euro covers it in Topic 4.2 as an example of old beliefs persisting alongside the new science of the Scientific Revolution.

### Did the Scientific Revolution end belief in astrology?

No, not for a long time. Astrology stayed popular among 17th-century elites, and major scientists like Kepler practiced it themselves. It declined gradually as Aristotelian cosmology collapsed and experimental methods took over, fading from respectability by the Enlightenment.

### What's the difference between astrology and astronomy in AP Euro?

Astronomy uses observation and math to study celestial bodies, and it's what Copernicus and Galileo transformed. Astrology claims those bodies predict human affairs. They were tangled together in the 1500s but separated during the Scientific Revolution, with astronomy becoming science and astrology becoming a continuity example.

### Why did Kepler believe in astrology?

Kepler thought the heavens genuinely influenced earthly life, a view inherited from centuries of European tradition, and he earned money casting horoscopes for nobles. His career is the exam's favorite illustration that one person could pioneer modern astronomy and practice astrology at the same time.

### How would I use astrology in an AP Euro essay?

Use it as continuity evidence in a change-and-continuity argument about the Scientific Revolution under LO 4.2.A. Citing Kepler's horoscopes (or Newton's alchemy) shows the shift to modern science was gradual, which adds the complexity graders reward.

## Related Study Guides

- [4.2 The Scientific Revolution](/ap-euro/unit-4/scientific-revolution/study-guide/TlVIEQWOBdTIF1JSwCTH)

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