Two other elemental gods were Samas, the Sun-god, and Sin, the Moon-god. Samas was the son of Sin, in accordance with the astronomical view of the old Babylonians, which made the moon the measurer of time, and regarded the day as the offspring of night. Samas, however, like Saul or Savul, another deity of whom mention is made in the inscriptions, was really but a form of Merodach, though in historical times the two divinities were separated from one another, and received different cults. Samas, again, was originally identical with Tammuz; but when Tammuz came to denote only the sun of spring and summer, while the myth that associated him with Istar laid firm hold of men's minds, Tammuz assumed separate attributes, and an individual existence apart from Samas. Sin, the Moon-god, was termed Agu or Acu by the Accadians, and if the name of Mount Sinai was derived from him, as is sometimes supposed, we should have evidence that he was known and worshipped in Northern Arabia. At all events he was one of the deities of Southern Arabia. Sin was the patron-god of the city of Ur, and it was to him that the Assyrian kings traced the formation of their kingdom. One of the most famous of his temples was in the ancient city of Harran, where he was symbolised by an upright cone of stone. As the emblem of the Sun-god was the solar orb, the emblem of Sin was the crescent moon. According to some of the legends of Babylonia, the daughter of the Moon-god was the goddess Istar. Other legends, however, placed Istar among the older gods, and made her the daughter of Anu, the sky. In either case she was at the outset the goddess of the evening star, and when it was discovered that the evening and morning stars were the same, of the morning star also. As the evening star, she was known as Istar of Erech, as the morning star, she was identified with Anunit or Anat, the goddess of Accad. At times she was also regarded as androgynous, both male and female.