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I don't have sufficient context to write an accurate overview of "1635." The context provided only indicates "year," which doesn't specify what 1635 refers to (a historical event, a book, a work of art, etc.). To provide an accurate, factual overview, I would need more specific information about what "1635" is.
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Article
September 12: The Treaty of Stuhmsdorf is signed between Sweden and the Polish–Lithuanian Commonwealth.
1635 (MDCXXXV) was a common year starting on Monday of the Gregorian calendar and a common year starting on Thursday of the Julian calendar, the 1635th year of the Common Era (CE) and Anno Domini (AD) designations, the 635th year of the 2nd millennium, the 35th year of the 17th century, and the 6th year of the 1630s decade. As of the start of 1635, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.