Hi Lee,
Yes, that was the first place I looked.
However, she hasn't got anything about Iunu as such, or at least not before the 6th dynasty. But she does mention the worship of Re showing in the 3rd dynasty burials. Unfortunately she does not specify how. I'd think she refers to the shape of the pyramids, which IMO, is nowhere near being evidence of sun worship, let alone such cult in Iunu. Do you know what this evidence is?
And as if this was not enough, I'd like to pick your brain about the name Iunu itself. I know that "iwn" means pillar, and that iwnw does not mean pillars in plural form, because it is written with a pot and not three strokes. In your opinion, what does iwnw mean? "The Pillar of Nun"?
Ritva