![]() ![]() Ptolemy’s advocacy for the tropical zodiac on the basis of precession did much for its widespread adoption by astrologers. That discovery was not widely known until many centuries later, after Ptolemy’s popularization of it (2nd century CE). That was prior to the 2nd century BCE discovery by Hipparchus of precession, the slow shifting of the tropical year relative to the stars. That zodiac was intended to be both tropical and sidereal to correspond with both the seasonal year and the stars. It was strongly shaped by both the tropical year of 12 lunar months, each roughly 30 days in length, as well as the stars, namely their constellations and the planetary periods relative to them. The original regular twelve-sign zodiac was a Babylonian invention. Geminos Compares the Greek and Babylonian Zodiacs.Tropical Zodiac without Knowledge of Precession.The Parapegma of Geminos and its Predecessors. ![]() No, Really, Finding the Equinox is Not so Simple.Early 5th Century BCE: Emergence of Twelve Signs.
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