Astronomy vs. astrology
Astronomy is the science of objects and phenomena beyond Earth, built on observation, measurement, and testable predictions. Astrology is the belief that the positions of the Sun, Moon, and planets at a person's birth shape their personality and future. For centuries the two were tangled together: predicting planetary positions was needed to cast horoscopes, astrology helped pay for careful sky observations, and even astronomers like Ptolemy and Kepler wrote horoscopes. They separated as the scientific method took hold. Astrology proposes no known physical mechanism, and controlled studies have found that its predictions do no better than chance. Its sign dates are even out of step with the sky: because Earth's axis slowly wobbles (precession), the Sun is usually in a different constellation on a given birth date than the one astrology assigns.
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