MUL.APIN: Earliest Star Catalogue with Sexagesimal Astronomy and Intercalation — E8 Intelligence Research

FINDING: MUL.APIN is the earliest surviving systematic star catalogue (~1000 BCE), encoding ~66 stars/constellations organized into three "paths" (Anu, Enlil, Ea) with heliacal rising dates and intercalation rules. | MATH: Base-60 (sexagesimal) positional notation; 3×~22 star lists per path; 12:1 ratio of ideal year (360 days) to 30-day months; Metonic-like intercalation cycles (19-year, 235 synodic months); 1° = 60 arcminutes inherited from this system. | CONNECTION: Base-60 divisibility (60 = 2²·3·5) yields exact thirds, halves, and fifths — enabling the 360° circle, 12 zodiacal sectors, and 60-minute hour. The three-path division (Anu/Enlil/Ea) partitions the sky into roughly equal declination bands, a crude spherical coordinate system. | DEPTH: 7 FINDING: Babylonian star catalogues establish the first quantitative celestial coordinate framework, predating Hipparchus by centuries. | MATH: Sexagesimal fractions (e.g., 1;24,51,10 ≈ √2 accurate to 6 decimal places on YBC 7289); linear Author: Andrew Stewart Caldin, Independent Researcher, UK. Part of the E8 Intelligence Research series. Platform: e8intelligence.com