The situation of Harran--the name itself signifies 'road'-- as the highway leading to the west, must have been an important factor, in bringing this about.

However this may be, Sin and Nannar are as thoroughly identical in the period following Hammurabi, as Babbar and Shamash.

The attributes of the one are transferred to the other so completely, that a separation of the two is no longer possible.
The ideographs with which the name of Sin is written show him to have been regarded as the god of wisdom, but while wisdom and light may be connected, it is Nannar's character as the "illuminator" that becomes the chief trait of the god.

No doubt the preeminence of Ea in this respect, who is the personification of wisdom, _par excellence_, made it superfluous to have another deity possessing the same trait.

It is, accordingly, as the god of light, that Sin continues to be adored in the Babylonian religion; and when he is referred to, in the historical texts and hymns, this side of his nature is the one dwelt upon.