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I don't have enough context to provide an accurate overview of what "1439" refers to. Could you provide more information about what "1439" is—for example, is it a historical event, a book, a scientific discovery, an invention, or something else?
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Article
June 29: The Miracle of the Moose takes place (modern fresco in Pechersky Ascension Monastery).
Year 1439 (MCDXXXIX) was a common year starting on Thursday of the Julian calendar.