Akkadian name of the moon god whom the Sumerians called Suen or Nannar. In writing this was expressed by the number 30, the days of the lunar month. He was also addressed as the “fruit that renews itself” (after the waning of the moon) and the “horned bull.” Like Nanna, he was closely associated with the fertility of cattle but also of women, as his epithet “midwife” suggests.
Apart from the ancient moon sanctuary at Ur, there was an important temple of Sin at Harran. Although Sin was popular throughout Mesopotamian history, as the many personal names composed with Sin prove, he never assumed the status of Enlil or Marduk, except for the time when the Babylonian king Nabonidusheavily promoted his cult in the sixth century B.C.
Historical Dictionary of Mesopotamia. EdwART. 2012.