The moon god in Mesopotamian mythology is known as Sin or Nanna. Sin is revered as the god of the moon, responsible for its phases and the cycles of time. His worship emphasizes themes of timekeeping, fertility, and the governance of the night. Rulers often sought Sin's favor for guidance in their decisions, signifying the moon's importance in agricultural practices. Sin's influence reflects the cultural significance assigned to celestial bodies in regulating both daily life and spiritual beliefs in ancient Mesopotamia.