Here's a breakdown:
* Ancient Mesopotamia (around 3000 BC): The Babylonians developed the first known system of zodiac signs. They divided the sky into 12 constellations, each associated with a specific month.
* Ancient Greece (around 500 BC): The Greeks adopted and further developed the Babylonian system, associating each constellation with a god or goddess and giving them the names we still use today.
* Astrology as a system: While the zodiac signs themselves have a long history, the practice of interpreting them to predict personality traits and future events became more prominent during the Hellenistic period and spread throughout the Roman Empire.
It's important to note that:
* The constellations have shifted over time: Due to the Earth's precession (a slow wobble), the constellations no longer line up with the same months they did in ancient times. This means your "true" zodiac sign, based on your actual birthdate and the exact position of the stars, might be slightly different from the traditional one.
* Astrology is not science: While the origins of the zodiac signs lie in astronomy, modern astrology is not a scientific practice. It's a belief system based on interpreting the positions of celestial bodies, and its accuracy is debated.
So, while the basic idea of zodiac signs is very old, their specific interpretations and use in modern astrology have evolved over time.