Francesca Rochberg

Babylonian astronomy, originating in Mesopotamia, utilized a sexagesimal (base-60) numeral system to meticulously record and calculate celestial movements. During the 8th and 7th centuries BC, a significant shift occurred with the development of an empirical approach, incorporating predictive planetary systems and an internal logic, which some scholars term a scientific revolution. This methodology profoundly influenced later Greek and Hellenistic astrology and astronomy, laying fundamental groundwork for subsequent scientific traditions worldwide.

Knowledge of Babylonian astronomy is largely derived from fragmented clay tablets, including astronomical diaries and procedure texts. Despite their incomplete nature, these fragments reveal a sophisticated understanding of planetary theory and a foundational role in the development of scientific astronomy. The Babylonians developed zodiacal signs, cataloged stars, and created systems for predicting celestial events like heliacal risings and the length of daylight, demonstrating an early attempt at mathematically describing astronomical phenomena. Their work also extended to omens, where celestial events were interpreted as divine messages, with eclipses considered particularly potent.

The study of celestial objects in ancient Mesopotamia, known as Babylonian astronomy, was characterized by its use of the sexagesimal numeral system. This base-60 system facilitated complex calculations and record-keeping. A pivotal development occurred in the 8th and 7th centuries BC when Babylonian astronomers adopted a new empirical methodology. This involved systematically observing and recording celestial phenomena, integrating philosophical ideas about the universe's ideal nature, and employing logical frameworks within their predictive planetary models. This innovative approach is considered by some modern scholars to represent a scientific revolution, profoundly impacting the philosophy of science and influencing subsequent astronomical traditions.

Babylonian astronomers are credited with developing the first functional theories of planetary motion. Surviving texts, such as the Venus tablet of Ammisaduqa from the 7th century BC, provide early records of planetary observations dating back potentially to the second millennium BC. Beyond scientific description, Babylonian astronomy was deeply intertwined with divination. Texts like Enuma Anu Enlil, compiled during the Neo-Assyrian period, list omens derived from celestial events, including planetary movements, and their perceived relationship to future occurrences. This practice established foundational elements for what would evolve into Western astrology, with celestial bodies seen as powerful indicators of divine will.

While distinct from their astronomical calculations, Babylonian cosmology and worldview are partially understood through surviving literature and mythology. A significant aspect of their belief system involved omens, with the gods believed to communicate future events through celestial phenomena. These omens, particularly those derived from planetary movements, were considered potent because they occurred independently of human action. Eclipses were regarded as the most ominous events. The Enuma Anu Enlil provides extensive insights into these sky omens, detailing interpretations of the Sun, Moon, and planets, reflecting a worldview where the cosmos held profound messages for humanity. The concept of averting predicted misfortune through Sumerian and Akkadian rites, such as 'nam-bur-bi' or 'namburbu', highlights a desire to mitigate the impact of these divine warnings.

The Babylonians developed sophisticated tools and systems for astronomical observation and calculation. The MUL.APIN tablets, dating from a similar period to the astrolabes, contain star catalogs and methods for predicting planetary risings and settings, as well as daylight duration. These texts organized stars along specific paths associated with deities like Ea, Anu, and Enlil. The astrolabes, early cuneiform tablets, list thirty-six stars linked to the months of the year, possibly integrating traditions from Elam, Akkad, and Amurru. The development of these astronomical records and the need for precise calculations spurred advancements in mathematics, with priests like Naburimannu credited with creating lunar and eclipse computation tables that influenced later astronomical work.