The Babylonian Zodiac and the First Horoscopes

Babylon (5th Century BCE)

First attested

450 BCEPreserved on cuneiform astronomical clay tablets (MUL.APIN and astronomical diaries).

Claimed

1000 BCEasserted by Earlier MUL.APIN star catalogues listing 18 constellations along the moon's path

The claim runs about 600 years ahead of the evidence.

The twelve-sign equal 30-degree division of the ecliptic coordinate system.

By the 5th century BCE in Persian-period Babylonia, Mesopotamian astronomer-priests created the twelve equal 30-degree signs of the zodiac, dividing the 360-degree solar path (ecliptic). This mathematical innovation transformed earlier omen divination (Enuma Anu Enlil) into predictive natal astrology. The earliest surviving personal horoscopes, recording planetary positions at birth to forecast an individual's future, date to 410 BCE in Babylon and Nippur.