The Venus tablet of Ammisaduqa is the record of astronomical positions for Venus, as preserved in numerous cuneiform tablets dating from the first millennium BC. It is believed that this astronomical record was first compiled during the reign of King Ammisaduqa, the fourth ruler after Hammurabi. Thus, the origins of this text could probably be dated to around the mid-seventeenth century BC despite allowing two possible dates.

Venus is the second planet from the Sun. It is a terrestrial planet and is the closest in mass and size to its orbital neighbour Earth. Venus is notable for having the densest atmosphere of the terrestrial planets, composed mostly of carbon dioxide with a thick, global sulfuric acid cloud cover. At the surface it has a mean temperature of 737 K and a pressure of 92 times that of Earth's at sea level. These extreme conditions compress carbon dioxide into a supercritical state close to Venus's surface.