adannu

Definition

Adannu is an Akkadian word meaning "appointed time, term, expected time." In Mesopotamian astronomy it names the fixed window of time within which a sky event is due to happen, or within which an omen's predicted outcome is expected to arrive. It carries two related senses: the standard time-of-occurrence for a recurring planetary or lunar event, and the window of validity during which an omen's threat must come true — once that window passes, the threat is treated as turned aside.

In Tradition

Hunger and Pingree document adannu as a working concept in the Sargonid scholar-letters: the standard hundred-day window of the Substitute King ritual, the EAE Tablet 20 commentary fixing the fourteenth day as the adannu for a lunar eclipse, and the per-planet adannu values that anchor period-based prediction of a body's first and last visibility. Rochberg-Halton (1988) treats the term as part of the technical machinery of the omen-validity calendar.

In Practice

When you read a Babylonian astronomical procedure text or a scholar's letter, the adannu is the threshold the scribe measures the current observation against. A planet that becomes first visible while "exceeding its term (adannu, also edānu)" by some number of days is reported as a deviation from what the schematic scheme expected — as in Letter 362, where Jupiter "appeared on the 6th of Simānu, exceeding its term by five days." For lunar eclipses, the EAE Tablet 20 commentary fixes the fourteenth day as the standard adannu; an eclipse on day 12 or 13 is then noted as happening "not according to its expected time." In the SAA 8 court correspondence, the adannu also bounds the window in which a namburbî ritual can still work, so the ritual response is timed to land before the predicted outcome can come true. Modern reconstructions of Babylonian omen practice treat the adannu as the link joining observation, schematic expectation, and timed ritual response.

Historical Origin

Adannu is attested in the cuneiform record from the EAE Tablet 20 commentaries through the Sargonid Astrological Reports (SAA 8, c. 700-650 BCE) and Royal Correspondence (SAA 10), and on into the Late Babylonian planetary procedure texts. Modern critical treatments: Hunger-Pingree, *Astral Sciences in Mesopotamia* (1999); Parpola, *Letters from Assyrian and Babylonian Scholars* (SAA 10, 1993); Rochberg-Halton, *Aspects of Babylonian Celestial Divination* (1988).

Further Reading

• Hermann Hunger & David Pingree, Astral Sciences in Mesopotamia
• Hermann Hunger, Astrological Reports to Assyrian Kings (SAA 8)
• Simo Parpola, Letters from Assyrian and Babylonian Scholars (SAA 10)