I remember in Keats's nightingale ode that Bacchus is associated with leopards - see line 32 below:
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Still, no reason to think Yeats is lamenting being sober at age 50. Nor do I see a Maud Gonne or an Irish Republic metaphor, though there might be one there. Bartleby suggests brave warriors or even sin, along with the leopard never changing his spots, all of which are less compelling than merely imagined pictures on the moon's surface.
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See Bartleby also for what is likely the correct text:
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When have I last looked on
The round green eyes and the long wavering bodies
Of the dark leopards of the moon?
All the wild witches, those most noble ladies,
For all their broom-sticks and their tears,
Their angry tears, are gone.
The holy centaurs of the hills are banished;
I have nothing but the harsh sun;
Heroic mother moon has vanished,
And now that I have come to fifty years
I must endure the timid sun.
Here we have repetitions only with tears & sun (for emphasis), and the star at the center of the solar system has become harsh yet timid. Still eleven lines, but the rhymes are now more attractive with abab cada dca.
Hmmm ... star at the center of his universe? Yup, could be dame Maud. She, who once was harsh/violent is now timid/shy?