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Stand by the grey stone when the thrush knocks, and the setting sun with the last light of Durin’s Day will shine upon the key-hole.
(hobbit.world)
This is the definition of Durin's Day:
Durin's Day was a yearly event noted by the Dwarves, "when the last moon of Autumn and the first sun of Winter appear in the sky together" (i.e. until sunset) on the first day of the Dwarves' New Year, which was "the first day of the last moon of Autumn on the threshold of Winter."
Since it's based on the moon, it doesn't happen on the same day every year.
The art of David Wenzel is just the best. His style is just so fun to me.
by David Wenzel
