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before the 8th century BCEReputable source · 2 sourcesWell documented

MUL.APIN Compiles Babylonia's Star Catalog

A two-tablet compendium lists 66 stars and constellations, sorted by the god each belongs to

On the timeline · around before the 8th century BCE · Ancient AstronomyAncient AstronomyMUL.APIN Compiles Babylonia's Star Catalog1,500 BCE1,250 BCE1,000 BCE750 BCE500 BCE250 BCE1 CE

Quick facts

Format
Two cuneiform tablets
Stars/constellations listed
66
Surviving manuscript copies
c. 40-60
Span of use
Neo-Assyrian period to Seleucid era, c. 8th-1st century BCE

What happened

Babylonian scribes compiled MUL.APIN, a two-tablet cuneiform compendium that became the most widely copied astronomical text in ancient Mesopotamia. It lists the names of 66 stars and constellations and gives rising, setting, and culmination dates for them, organizing the sky into three celestial paths assigned to the gods Enlil, Anu, and Ea. Alongside the star list, MUL.APIN records planetary phases, mathematical schemes for the changing length of day and night across the year, rules for the luni-solar calendar, and a short collection of celestial omens linking sky events to predictions for the king and the state. The text survives in roughly 40 to 60 manuscript copies spanning from the Neo-Assyrian period through the Seleucid era, a span of some seven centuries.

Why it matters

MUL.APIN organized centuries of naked-eye Babylonian sky-watching into a single reference work that scribes kept copying for 700 years, giving Mesopotamian astronomy a stable, shared framework for tracking stars and predicting calendar events. This systematized star knowledge fed into the eclipse-prediction records kept in the later Astronomical Diaries and eventually reached Greek astronomers, who built their own geometric models on top of the positional data Babylon had already gathered.

How we know

MUL.APIN survives on dozens of cuneiform tablets excavated across Mesopotamia and now held in museum collections worldwide; Assyriologists have cross-checked the star and constellation lists against later Babylonian and Greek astronomical texts to confirm the continuity of the tradition.

Sources

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