The author uses magic realism by comparing the description of the setting sun with a flaming ribbon.
Magic realism is a genre of literature in which mythical events are introduced in realistic settings. This genre of writing is often found in Latin American literature.
In the above description,the mention of the flaming ribbon calls to mind elements of mystism. The setting sun, on the other hand, is a realistic event.
So, the fusion of these two yield magic realism.
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