Hierarchy classification:

1. top of the aat hierarchies
2. Associated Concepts Facet
3. Associated Concepts (hierarchy name)
4. multidisciplinary concepts
5. [dates and dating systems]
6. dating systems
7. [dating systems by specific type]

Anotations

Scope note:

Lunisolar calendar of Assyria and Babylon, having years consisting of 12 lunar months, each beginning a new crescent moon on the western horizon at sunset. It was based on a Sumerian calendar, dated at least to ca. 21st century BCE.