From Temple Records to the Zodiac

Keeping this calendar accurate required sustained, careful observation of the night sky by temple-attached scholars, and that practical need became one of the seedbeds of Babylonian astronomy and astrology as independent disciplines. Francesca Rochberg's study of Mesopotamian divination and astronomy traces how calendar-keeping observation records evolved over centuries into far more ambitious projects, including the astronomical compendium known as MUL.APIN and, by the middle of the first millennium BCE, the earliest personal horoscopes anywhere in the historical record, all built on the same underlying lunar and planetary observation practice the calendar itself required.

The Babylonian calendar's influence also extended well beyond Mesopotamia's own religious life. Its month names, in only lightly altered form, were adopted into the Jewish calendar, a debt most scholars trace to the Babylonian captivity, and its broader intercalation logic shaped the family of lunisolar calendars used across much of the later ancient Near East, a comparative history surveyed in the Oxford Companion to the Year alongside the solar and purely lunar systems it eventually stood beside.