SES.KI

SES.KI, or Nanna (Sumerian: 𒀭𒋀𒆠 DŠEŠ.KI, DNANNA) was the god of the moon in the Mesopotamian mythology of Akkad, Assyria and Babylonia. Nanna is a Sumerian deity, the son of Enlil and Ninlil. The two chief seats of Nanna's/Sin's worship were Ur in the south of Mesopotamia and Harran in the north. {|align=right width=36%

Enlil and Ninlil
The Sumerian ”Enlil and Ninlil” tells of the descent of Enlil and Ninlil, pregnant with Nanna/Sin, into the underworld. There, three "substitutions" are given to allow the ascent of Nanna/Sin. The story shows some similarities to the text known as "The Descent of Inanna".
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Nanna
The earliest spelling found in Ur and Uruk is DLAK-32.NA (where NA is to be understood as a phonetic complement). The name of Ur, spelled (cuneiform: 𒋀𒀕𒆠) LAK-32.UNUGKI=URIM2KI, is itself derived from the theonym, and means "the abode (UNUG) of Nanna (LAK-32)". He was also the father of Ishkur.

The pre-classical sign LAK-32 later collapses with ŠEŠ (the ideogram for "brother"), and the classical Sumerian spelling is DŠEŠ.KI, with the phonetic reading na-an-na. The technical term for the crescent moon could also refer to the deity, (cuneiform: 𒀭𒌓𒊬 DU4.SAKAR). Later, the name is spelled logographically as DNANNA.

Sin
Sin had a beard made of lapis lazuli and rode on a winged bull. The bull was one of his symbols, through his father, Enlil, "Bull of Heaven", along with the crescent and the tripod (which may be a lamp-stand). On cylinder seals, he is represented as an old man with a flowing beard and the crescent symbol. In the astral-theological system he is represented by the number 30 and the moon. This number probably refers to the average number of days (correctly around 29.53) in a lunar month, as measured between successive new moons.