Final answer:
The smaller ceremonial center in Uruk associated with the sky-god An was the Temple of Anu, which was part of the Anu Ziggurat with the White Temple built atop.
Step-by-step explanation:
In Uruk, one of the ceremonial centers that has been excavated is known as the Temple of Anu. This temple was associated with the sky-god, An, who was considered the father of all gods and represented patriarchal authority. The Anu Ziggurat, dating back to around the late 4th millennium BCE, was an impressive structure with the White Temple built on its apex. It was a significant religious and political center of the city, reflecting the theocratic political system of the era, where deities were recognized as rulers.