The concept of star sign compatibility emerged in ancient Mesopotamia, where astronomers recorded planetary movements and correlated them with human events. By the 2nd century BCE, Greek astrologers had refined these observations into the zodiac system, assigning personality traits to each sign and speculating on their interplay in relationships.
The 20th century marked a turning point as astrology intersected with psychology. Figures like Jung and later pop culture icons repackaged star signs as symbolic frameworks, shifting focus from prediction to introspection. This era cemented compatibility readings as a cultural staple, blending mysticism with modern self-help.