Are Astrology and Astronomy the Same Thing? A Detailed Look at Their Differences and Similarities

Astrology and astronomy are often confused as being the same field of study, but while they are related in some ways, there are distinct differences between the two. In this in-depth blog post, we’ll explore what each subject is, their origins, how they differ, and where they overlap.

What is Astrology?

Astrology is an ancient practice dating back thousands of years that studies the positions and movements of celestial objects like stars, planets, and constellations and how they relate to human affairs and terrestrial events. Astrologers build astrological charts based on someone’s birthdate and location to gain insight into their personality, relationships, and life path.

Some key aspects of astrology include:

The 12 Signs of the Zodiac

There are 12 signs of the zodiac in astrology: Aries, Taurus, Gemini, Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius, Capricorn, Aquarius, and Pisces. Your zodiac sign is determined by the position of the sun at the time you were born.

Reading Birth Charts

Astrologers use birth charts, also called natal charts, to study how the planets lined up at your exact time and place of birth. This helps them interpret how those planetary positions impact you.

Aspects and Transits

Astrologers look at angles (aspects) formed between planets in your birth chart and how outer planets moving through the zodiac (transits) interact with the planets in your natal chart over time. This reveals information about your life.

Astrology and Fate

A central principle of astrology is that the positions of celestial bodies at our birth impact our personality and destiny. Many astrologers believe we all have free will to work with our natal potential.

What is Astronomy?

Astronomy is a natural science that focuses on the study of celestial objects like stars, galaxies, planets, moons, asteroids, comets and nebulae. Astronomers analyze the physical universe and attempt to explain phenomenon like gravitational effects, the evolution of stars, and the formation of planetary systems.

Some key aspects of astronomy include:

Observing the Cosmos

Astronomers use technology like telescopes to observe and collect data about astronomical objects and phenomena. This allows them to analyze things distant stars, the composition of exoplanets, and the expansion of the universe.

Understanding Physics

Astronomers study the physics behind cosmic systems and phenomena like orbital mechanics, stellar evolution, dark matter, light wavelengths, and more. This allows them to model stellar lifecycles and analyze the evolution of galaxies.

No Horoscopes

Astronomers do not put any credence in astrological horoscopes or birth charts. They focus only on the physics and observable data behind celestial bodies and systems.

Quest for Knowledge

A driving goal behind astronomy is understanding our place in the universe. Astronomers continue to expand our knowledge about the cosmos, from our solar system to distant quasars.

The Main Differences Between Astrology and Astronomy

While astrology and astronomy refer to many of the same celestial bodies and systems, they have distinct contrasts:

  • Purpose: Astrology aims to predict earthly matters and gain insight into human personality and events. Astronomy seeks to understand the physical universe beyond Earth.
  • Basis: Astrology uses mythological frameworks like zodiac signs and aspects between planets to interpret meaning. Astronomy relies on scientific observation and physical properties.
  • Methodology: Astrologers use birth charts and interpret planetary alignments symbolically. Astronomers use technology like telescopes to make measurable observations.
  • Status: Modern astronomy is widely accepted as scientific, while astrology is considered a pseudoscience by the scientific community.
  • Horoscopes: Astrologers use horoscopes to advise people on their lives. Astronomers reject horoscopes as having no scientific validity.

Where They Overlap

While differing in many ways, astrology and astronomy also have some notable overlaps:

  • Both fields involve the study of celestial objects like stars, planets, asteroids, and comets.
  • Each field catalogs constellations and the movement of celestial bodies through the sky from Earth’s perspective.
  • Some concepts like moon phases, eclipses, and equinoxes are important in both astrology and astronomy.
  • Astrology and astronomy contributed to each other’s development historically in civilizations like Babylonia, though they later diverged as astronomy became more empirical.
  • Both fields require knowledge of spherical geometry and precise calculation of planetary positions and orbits.
  • Astrologers and astronomers rely on well-defined systems to track and interpret celestial movements, though the systems differ significantly in their premises.


While astrology seeks to uncover meaning and divination through celestial bodies, astronomy focuses on tangible observation and physics. Astronomy is a quantifiable natural science while astrology operates in the realm of mysticism and philosophy.

But they both involve impassioned study of planets, stars, and their dance through space and human history. With deeper understanding, we can better grasp how these ancient disciplines both connect and differ.


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.

Tester, S. J. (1987). A history of western astrology. Woodbridge, Suffolk, UK: Boydell Press.

Vessantara. (2003). Astrology: An introduction. London, England: Rider.

Carlson, Shawn. 1985. “A double-blind test of astrology”. Nature, Vol. 318, pg. 419.

Dean, G. et al. (1996). Recent advances in natal astrology: A critical review 1900-1976. Astrological Association.

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