Astrology vs Astronomy: Defining the Differences

Astrology and astronomy are often confused as being the same field of study, when in fact they are quite different. While both relate to the stars and planets, their approaches and purposes diverge significantly. This article will clearly define and explain the key differences between astrology and astronomy.

What is Astrology?

Astrology is the study of how the positions and movements of celestial bodies impact human lives and events on earth. Astrologers believe that the placement of the sun, moon, planets and stars at the time of a person’s birth shapes their personality, character and destiny.

Some key points about astrology:

  • Based on the pseudoscientific belief that celestial bodies influence human affairs
  • Seeks to predict future events and reveal information about a person’s life through horoscopes and zodiac signs
  • Divides the heavens into 12 zodiac signs named after constellations like Aries, Taurus, Gemini
  • Involves interpreting birth charts based on exact time and location of birth
  • Provides guidance about auspicious times and compatibility between zodiac signs

What is Astronomy?

Astronomy is the scientific study of celestial bodies and the universe. Astronomers apply physics, chemistry and mathematics to understand the origins, evolution and properties of planets, stars, galaxies and cosmic phenomena.

Some key points about astronomy:

  • Based on centuries of scientific observation, experimentation and models
  • Seeks to explain through scientific evidence how the universe works
  • Studies celestial phenomena like planetary motion, star formation, black holes, dark matter
  • Uses technology like telescopes and spacecraft to directly observe outer space
  • Provides factual data about the composition, positions, distance and motion of celestial bodies

The Crucial Difference

While both astrology and astronomy study celestial objects, the critical difference lies in the methods and purposes used. Astrology is a pseudoscience that makes predictions about human affairs based on the perceived influence of the stars and planets. Astronomy is an evidence-based, scientific field that objectively studies the measurable characteristics of celestial bodies.

Astrology is considered unscientific because it relies on mystical beliefs rather than verifiable evidence to make claims about personalities, predictions and fate. In contrast, astronomy relies on the scientific method – systematic observation, measurement, testing and modification of hypotheses. Findings in astronomy can be confirmed and replicated, unlike in astrology.

An Example

Let’s take an example to highlight the difference between the astrological and astronomical perspectives:

An astrologer would say that because Mercury is in retrograde, communication problems will arise over the next few weeks.

An astronomer would explain that Mercury appearing to move backwards in its orbit (retrograde motion) is simply an optical illusion from our vantage point on Earth. Its retrograde periods occur predictably due to the differences in orbital speed between Earth and Mercury.

While both notice the same astronomical phenomenon, the astrologer ascribes supernatural powers to it, while the astronomer provides a scientific, evidence-based explanation.

In Conclusion

  • Astrology deals with mystical predictions about human affairs and personalities based on celestial objects
  • Astronomy objectively studies and measures the observable characteristics of celestial objects using science
  • One is a pseudoscience, the other is evidence-based science
  • Astrology relies on beliefs, while astronomy relies on verifiable facts and experiments
  • While both relate to celestial bodies, they have very different purposes and methods

So in summary, while astrology and astronomy may appear similar at first glance, they are fundamentally different fields. Their contrasting approaches, purposes and methods set them far apart. I hope this explanation clearly defines these two fields and clarifies the key distinctions between astrology and astronomy.


Britannica, T. Editors of Encyclopaedia (2016, February 29). astronomy. Encyclopedia Britannica.

Britannica, T. Editors of Encyclopaedia (2009, July 20). astrology. Encyclopedia Britannica.

Fraknoi, A. (2019). Astronomy vs. Astrology: The Differences. Astronomical Society of the Pacific.

NASA. (2018, August 3). What’s the Difference Between Astronomy and Astrology? NASA.

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