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  • Sylvia Rose

Difference Between Astrology & Astronomy in the Ancient World

Astrology and astronomy blur boundaries in the ancient world. Similar at a glance, the two serve different needs in society and progress. At first, astrology is taught in schools of medicine, while astronomy is considered amateur practice.



an astrologer of ancient times


The astrology signs first appear under Persian rule between 409 - 398 BCE. Each sign contains 30° of celestial longitude, thus creating the first known celestial coordinate system.


Thrasyllus of Mendes (Egypt) is one of the pioneering astrologers to introduce Hermetic astrology to Rome during the first century AD, as personal astrologer to Emperor Tiberius. He's a personal friend of Tiberius, as attested by Tacitus and Suetonius.



Astrology chart with symbolic references
Astrology chart with symbolic references

Tiberius is the first emperor to employ a court astrologer, though his predecessor Augustus uses astrology as a propaganda tool to reinforce Imperial authority. Emperor Nero banishes astrologers from Rome and makes divining one's death date, especially his, a criminal offense.


Astrology: The Cosmic Guide


Astrology, derives from the Greek words 'astro' (star) and 'logia' (study), is based on the belief the positions and movements of celestial bodies can influence human affairs and natural phenomena. In the ancient world, astrology is an integral part of daily life.



The Greek Argo, divine ship of Jason & the Argonauts
The Greek Argo, divine ship of Jason & the Argonauts

Astrologers in civilizations like Babylon, Egypt, and Greece view the cosmos as a living entity, where celestial alignments correlate with events on Earth. Planets, stars, unseen chaos all have influence. Kings consult astrologers before making critical decisions.


Battles are timed according to astrological forecasts, and people use horoscopes to determine auspicious times for marriage, harvests, and other life events. The Babylonians are pioneers of astrology, recording celestial movements as early as the third millennium BCE.



gazing into the sky


Their work invokes the mystique and complexity of astrological systems, seeking patterns in the heavens to predict earthly outcomes. When the Greeks inherit this system, notable figures like Ptolemy contribute to the synthesis of knowledge and proliferation of horoscopic astrology.


Astronomy: The Science of the Heavens


In contrast, astronomy emerges as a scientific discipline, focused on understanding celestial bodies and the laws governing their motion. Astrology derives meaning and influence from the stars and planets. Astronomy explains their physical properties and movements.



Star cluster in a nebulous nursery. The red stars are dying, releasing gasses, and the blue stars are being born.
Star cluster in a nebulous nursery. The red stars are dying and the blue stars are being born.

Ancient astronomers, such as the Babylonians, Greeks, and later, the Islamic scholars keep meticulous records. They catalogue stars, planets, and other celestial objects, developing techniques to measure time and establish calendars based on lunar and solar cycles.


Greeks such as Hipparchus and Ptolemy purvey the geocentric or earth centered models of the universe. These concepts dominate natural sciences and perspectives until the 1543 AD demise of Copernicus, who dares not publish his heliocentric theory until he's on his deathbed.



measuring equipment


Astronomy in the ancient world is often practiced alongside astrology. Many astronomers begin their studies by observing celestial events of astrological significance.


Diverging Paths: Science and Belief


As ancient civilizations progressed, the distinction between astrology and astronomy begins to sharpen. By the time of the Renaissance, the scientific revolution brings a critical shift. Figures like Copernicus, Galileo, and Kepler propose daring theories opposing the geocentric view.



solar eclipse


Rather than seeing the stars as symbolic forces that dictated human fate, humans adopt a more empirical approach. Astronomy transforms into a discipline governed by mathematics, physics, and observations, seeking to uncover the fundamental laws of the universe.


Astrology continues to thrive but becomes more spiritual and personalized. With the rise of the Enlightenment, astrology faces skepticism from scientists, eventually being relegated to the realm of pseudoscience. Astronomy prevails, rooted in rigorous scientific methodology.



giant telescope

The ancient world is a crucible for development of astrology and astronomy. While astrology becomes as a mystical interpretive practice, aligning celestial movements with human affairs, astronomy explores the universe to discover the mechanics of celestial phenomena.



Non-Fiction Books:


Fiction Books:

READ: Lora Ley Adventures - Germanic Mythology Fiction Series

READ: Reiker For Hire - Victorian Detective Murder Mysteries







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