Is "The sun had hidden itself" personification?

Yes.

Explanation:

The definition of "personification" is:

per·son·i·fi·ca·tion

/pərˌsänəfəˈkāSH(ə)n/

noun: personification

the attribution of a personal nature or human characteristics to something nonhuman, or the representation of an abstract quality in human form.  

The sun is obviously not able to consciously hide itself of its own accord. It just does it because that's what it was created to do at night!

So, by attributing night or cloud cover to the sun itself, the author has "personified" the sun.

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:)

nobody can answer this if you dont show us the shapes