I don't think there is a definitive answer. The only refference I know of in LotR is somewhat questionable:
Quote:
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Originally Posted by The Great River, chapter IX, FotR
Frodo looked up at the Elf standing tall above him, as he gazed into the night, seeking a mark to shoot at. His head was dark, crowned with sharp white stars that glittered in the black pools of the sky behind.
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