The tenth day of the ninth month of 1446 of the lunar calendar in 1446 was equivalent to October 9 of the Julian calendar.
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In 1934, arose the claim that they must assume that the Julian calendar was used in 1446, so the date was again changed to October 28.
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According to the Sejong Sillok (세종실록;世宗實綠), King Sejong proclaimed publication of Hunmin Jeongeum (훈민정음;訓民正音), the document introducing the newly created alphabet which was also originally called by the same name, in the ninth month of the lunar calendar in 1447.
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