In RoTK Tolkien writes in the index, where he explicitly refers to the rhyme, "[the] Seven stars, of Elendil and his captains. ... [They] originally represented to single stars on the banners of each of seven ships (of 9 [three times three]) that bore a palantir; in Gondor the seven stars were set about a white-flowered tree, over which the Kings set a winged crown."
Moreover, he writes that the Seven stars in the emblem of Durin represented the Plough.
c.c.
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