" There is one certain sky above, why is it referred to with an indefinite article? Tolkien is thinking that there are different kinds of sky. eg a pale sky, a red sky, a blue sky, a dark sky, etc.
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Cool Breeze There are numerous expression in which an adjectival attribute brings on a/an:It still seems to fly in the face of prescriptivism. We could also look at an album of Bush pictures, and say "This is the angry Bush, this is the thoughtful Bush, this is the confused Bush."