A key document is the Venus tablet of Ammisaduqa, preserving record of astronomical observations of Venus, as preserved in numerous cuneiform tablets during the reign of the Babylonian king Ammisaduqa, known to be the fourth ruler after Hammurabi in the relative calendar.
The Venus tablet of Ammisaduqa (Enuma Anu Enlil Tablet 63) refers to the record of astronomical observations of Venus, as preserved in numerous cuneiform tablets dating from the first millennium BCE.