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While the clay used to write cuneiform tablets is well suited to impressing the wedges of cuneiform signs it is not an ideal medium for the curved lines and detailed marks needed to create illustrative diagrams of the heavens well known in neighboring cultures. Yet, in a selection of examples, cuneiform scholars of astronomy and astrology used clay to sketch out complex diagrams of celestial arrangements and schematic representations of astrological concepts. This article will survey the corpus of astronomical and astrological diagrams preserved from cuneiform sources and summarize key observations about the relation of diagrams to texts and tablets and the representation of theoretical knowledge.