lumāšu

Definition

Lumāšu (Akkadian "figure" or "constellation"; written LU.MAŠ or LU.MAŠ.MEŠ) is the Late Babylonian term for a zodiacal sign — one of the twelve 30-degree segments into which the ecliptic was divided in the fifth century BCE. It also designates, in the older stellar-lexicon tradition preserved in Koch-Westenholz's Great Star List, a grouping of seven named constellations. The two senses share the underlying meaning "celestial figure" while marking different historical strata of Babylonian sky-classification.

In Tradition

Assyriological scholarship treats lumāšu as the native Babylonian name for the zodiacal sign in its mathematical-astronomical form. Rochberg explains that once defined by degrees of longitude normed by fixed stars, the lumāšu signs ceased to have any real relation to the ecliptical constellations from which they took their names and became a purely computational reference system. Koch-Westenholz notes that when the lumāšu symbol differs from the literal meaning of its Babylonian name, the symbol tends to agree with the Greco-Roman zodiacal name.

In Practice

For the student of how Babylonian astronomy mathematized the sky, lumāšu marks the lexical signature of a major conceptual leap: from observation-anchored ecliptical constellations to abstract 30-degree segments computable by arithmetic schemes. Rochberg traces the transition from the older harrān Sin ("path of the moon") system — a band of irregularly-sized constellations listed at MUL.APIN I iv 31-39 — to the lumāšu twelve-fold equal division, with earliest cuneiform evidence in fifth-century BCE Diaries and in horoscopes Texts 1 and 2 (both -409). The Babylonian zodiac was at all times sidereal, with degrees reckoned within a sign (0-30°), not on a continuous 360° ecliptic. Koch-Westenholz documents that lumāšu-tablets pictorially fix each sign's iconography, providing the visual handover-material for the Babylonian-to-Hellenistic transmission of the zodiac. The same word also designates, in the Great Star List Appendix B line 230, a distinct seven-constellation grouping — a parallel sevens-grouping alongside the ziḫpu (Point) stars.

Historical Origin

The zodiacal sense of lumāšu dates from the standardization of the 12-sign zodiac in the fifth century BCE; earliest cuneiform evidence in fifth-century Diaries and horoscope Texts 1 and 2 (both -409). The Great Star List seven-grouping is attested at line 230 (Koch-Westenholz Appendix B p. 199). Modern critical treatments: Rochberg, *Babylonian Horoscopes* (1998), Chapters 2-3; Koch-Westenholz, *Mesopotamian Astrology* (1995), pp. 82-83 + Appendix B p. 199.

Further Reading

• Francesca Rochberg, Babylonian Horoscopes
• Ulla Koch-Westenholz, Mesopotamian Astrology