Astrology vs Astrophysics: Understanding the Difference

Astrology and astrophysics are two fields that study the stars, but they have some major differences in their approaches and areas of focus. In this post, we’ll explore what each one is all about.

What is Astrology?

Astrology is an ancient practice that originated over 4000 years ago in ancient Mesopotamia. The basic premise of astrology is that the positions and movements of celestial bodies like the Sun, Moon, and planets can influence human affairs and terrestrial events.

Some key aspects of astrology include:

  • Natal Astrology – Producing birth charts based on the exact time and location someone was born to analyze their personality, strengths, weaknesses, and life path.
  • Zodiac Signs – Dividing the sky into 12 sections associated with constellations known as zodiac signs like Aries, Taurus, and Gemini. Your zodiac sign is determined by where the Sun was located at the exact time you were born.
  • Horoscopes – Astrologers analyze planetary positions at a given time, such as someone’s birth, to forecast future possibilities and give advice. Daily, weekly, monthly and yearly horoscopes are popular in magazines and newspapers.
  • Symbolic Interpretation – Astrology uses the movements of celestial bodies as symbolic language to uncover information about human affairs and terrestrial developments.

What is Astrophysics?

In contrast to astrology, astrophysics is a branch of astronomy that applies the laws of physics and chemistry to analyze astronomical objects like stars, planets, and galaxies. Some key aspects of astrophysics include:

  • Understanding stellar evolution – Astrophysicists study how stars are formed, what fuels them, and how they eventually die. For example, they may calculate the lifecycle of a star using physics-based models.
  • Mapping cosmic structures – Astrophysicists analyze the large-scale structures of the universe, such as grouping of stars known as galaxies and massive collections of galaxies called galaxy clusters.
  • Exploring black holes – These mysterious regions of spacetime where gravity is so strong that nothing can escape are a major focal point for astrophysicists. General relativity is applied to understand black holes.
  • Developing theoretical models – Astrophysicists come up with theories based on physics, such as Einstein’s theory of general relativity, to predict and explain celestial phenomena. These models are tested with observational and experimental data.

Contrasting the Fields

While both astrologers and astrophysicists study celestial bodies, there are a few key differences between these fields:

  • Astrology relies on symbolic interpretation and meaning, while astrophysics relies on scientific methods and objectivity.
  • Astrology presumes celestial bodies influence human affairs, while astrophysics studies those bodies as physical systems without assuming an effect on humanity.
  • Astrology has been debunked by scientific testing, while astrophysics is considered a mainstream scientific field.
  • Astrology aims to provide enlightenment about human lives and events, while astrophysics aims to understand the physical universe.

So in short, astrology attempts to find meaning in the stars, while astrophysics attempts to find measurable facts and observable phenomena. The two approaches are fundamentally different.

Can They Coexist?

While astrology and astrophysics are vastly different fields, the question arises whether they can coexist peacefully. Some perspectives on this:

  • For some, astrology is a spiritual practice separate from the scientific realm of astrophysics, and the two need not conflict.
  • Others argue that belief systems without scientific evidence like astrology should not be given legitimacy in modern society.
  • Many astrophysicists are critical of astrology, arguing there is no credible evidence celestial bodies can influence human affairs.
  • Some astrologers counter that science cannot measure or explain everything, especially something as mystical as the connection between the cosmos and humanity.

Overall, there are differing views on whether astrology deserves to persist alongside modern science like astrophysics. The debate continues.


Astrology and astrophysics fundamentally differ in their worldviews, approaches, and purposes. Astrology seeks meaning in the stars using symbolic interpretation, while astrophysics empirically studies the physical universe using scientific methodology. While some see room for both to coexist, others argue astrology lacks credibility from a scientific perspective. Understanding these key differences helps shed light on this complex debate.


Thagard, Paul R. 1978. “Why Astrology is a Pseudoscience”. PSA: Proceedings of the Biennial Meeting of the Philosophy of Science Association, Vol. 1978, Volume One: Contributed Papers (1978), pp. 223-234. The University of Chicago Press.

Kessler, Elizabeth. 2019. “No, NASA hasn’t found astrology’s ‘missing’ 13th zodiac sign”.

American Astronomical Society. 1975. “Objections to Astrology: A Statement by 186 Leading Scientists”. The Humanist, September/October 1975. The American Humanist Association.

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