Astrology and astronomy

Overview

In pre-modern times, most cultures did not clearly separate the two disciplines. In ancient Babylonia, the same person both predicted celestial phenomena and interpreted them astrologically. In ancient Greece, pre-Socratic thinkers like Anaximander and Xenophanes speculated about the nature of stars and planets. Astronomers such as Eudoxus observed planetary motions and created a geocentric model later accepted by Aristotle, which lasted until Ptolemy added epicycles to explain Mars's retrograde motion.

Around 250 BC, Aristarchus of Samos proposed a proto-heliocentric theory, but it was not reconsidered for nearly two millennia, as Aristotle's geocentric model remained favored. The Platonic school promoted astronomy as part of philosophy because heavenly motions demonstrated an orderly cosmos. In the third century BC, Babylonian astrology began influencing Greece. Hellenistic philosophers like Carneades and Panaetius criticized astrology, but Stoic doctrines of the Great Year and eternal recurrence supported divination and fatalism.

In the Hellenistic world, 'astrologia' and 'astronomia' were often used interchangeably but were conceptually distinct. Plato taught 'astronomia' and required geometrical models; Eudoxus provided the first solution. Aristotle favored a physical approach and used 'astrologia'. For the general public, the distinction was not evident.

Babylonian horoscopic practice used 'apotelesma' and 'katarche', but otherwise fell under Aristotle's term 'astrologia'.

Distinguishing characteristics

Astronomy aims to understand the physics of the universe through the scientific method, naturalistic presuppositions, and abstract mathematical reasoning. Astrologers use astronomical calculations for celestial positions along the ecliptic and attempt to correlate celestial events with earthly affairs, employing mystical or religious reasoning, folklore, symbolism, and superstition blended with mathematical predictions. The scientific method is not consistently used by astrologers.

Astrologers practice geocentrically and view the universe as harmonious, changeless, and static, while astronomers infer a dynamic, centerless universe expanding per the Big Bang theory. Astrologers believe stars and planets determine personality and future; astronomers find no evidence supporting astrological theories. Psychologists study personality but do not base mainstream theories on astrology, though the Myers-Briggs typology, based on Carl Jung, has four categories corresponding to astrological elements and is used by career counselors and life coaches.

Both astrologers and astronomers see Earth as integral to the cosmos, but astrologers portray the cosmos as having a supernatural, metaphysical, divine essence actively influencing events, while astronomers cannot use non-empirical explanations in scientific articles.

Astrology and zodiac signs in the modern age

Many philosophers and astronomers consider astrology a false representation of the universe, though believers argue for its connection to the human condition. The most popular form is horoscopes, spread through social media and news outlets, associating planets like Mars with human emotions such as drive and courage. Although astrology was considered factual in ancient science, it is now used as a spiritual belief system. Ancient forms often combined with astronomy but split during the time of Copernicus, Kepler, and Galileo.

Modern zodiac signs are constructed from constellations and used to associate human emotions and tendencies with stars and heavenly bodies. Astrology has become somewhat of a pseudo-religion due to emphasis on constellation meanings and their relation to individuals. People may judge others based on zodiac signs because each sign carries unique listed traits that reflect on the person.