Astrology

Astrology is a system of beliefs that suggests a connection between astronomical occurrences and aspects of human life, including personality traits and future events. Despite its historical influence and the development of astronomy it spurred, the scientific community has consistently rejected astrology due to a lack of empirical evidence. Rigorous testing has failed to demonstrate its purported effects, leading to its classification as pseudoscience. There is no scientifically accepted mechanism to explain how celestial bodies could influence earthly events in the manner described by astrological traditions, and proposed predictions have been falsified when subjected to scientific scrutiny.

The practice of astrology has deep historical roots, originating with the Babylonians and evolving through the Hellenistic period. Early Western astrology was influenced by the concepts of the macrocosm and microcosm, linking celestial events to earthly occurrences, including medicine. This pursuit also motivated advancements in astronomy, as accurate calculations of planetary movements were essential. During the Islamic Golden Age, astronomical observatories were funded to provide precise data for astrological predictions, though the practice faced religious opposition. Modern scientific inquiry often focuses on potential correlations between astrological traditions and seasonal birth influences. Despite its lack of scientific credibility, belief in astrology persists, sometimes even among scientifically literate individuals.

Astrology is frequently cited as a prime example of pseudoscience because it has repeatedly undergone scientific testing and consistently failed to yield verifiable results. Philosophers of science like Karl Popper have identified astrology as a pseudoscience based on the criterion of falsifiability, noting that it appeals to observation and experiment but does not adhere to scientific standards. When astrological predictions have been falsified by experiments, such as the famous test conducted by Shawn Carlson, the theories have not been revised in a scientifically meaningful way. Instead, failures are often explained away, a characteristic that distinguishes it from scientific disciplines. Thomas Kuhn argued that astrology's unscientific nature stems from its non-empirical processes and concepts, likening it to medieval medicine in that it followed established rules for a field with known limitations but did not engage in research or problem-solving.

Paul Thagard further supports the classification of astrology as pseudoscience by highlighting its lack of progress over nearly two millennia and the absence of a community of researchers actively comparing its theories to alternatives. He posits that a field is not considered pseudoscience until a viable successor theory emerges. Astrology has also been criticized for its inherent irrationality, characterized by fallacious logic, poor reasoning, a lack of coherence, and an insensitivity to evidence within its literature. Edward W. James points out that astrological writings often demonstrate a stubborn unwillingness to follow arguments to their logical conclusions or to establish a hierarchy of reasons, further undermining its claim to scientific validity.

The theoretical underpinnings of astrology trace back to the Babylonians and gained widespread traction during the Hellenistic period. Early Western astrological thought incorporated the Greek concepts of the macrocosm and microcosm, suggesting a correspondence between celestial phenomena and events on Earth, including human health. This connection provided a significant impetus for the development of astronomy, as precise calculations of planetary movements were essential for astrological practice. Even figures like Ptolemy, while defending astrology, acknowledged the superior predictive power of astronomy regarding celestial motions.

During the Islamic Golden Age, the study of astronomy received significant funding, partly to achieve the accuracy needed for Ptolemaic models, which were crucial for astrological calculations. Rulers and viziers supported the construction of observatories to gather precise planetary data for astrological predictions. However, the prohibition of astrology within Islam led to the dismantling of many of these observatories shortly after their construction. The separation of astronomy and astrology became more pronounced in Western scientific discourse starting in the late 17th century, with publications like 'La Connoissance des temps' beginning to reject astrological tenets. In Iran, resistance to heliocentrism persisted into the 20th century, partly due to fears that it would undermine the established beliefs in astrology and Islamic cosmology.