1639

1639 (MDCXXXIX) was a common year starting on Saturday of the Gregorian calendar and a common year starting on Tuesday of the Julian calendar, the 1639th year of the Common Era (CE) and Anno Domini (AD) designations, the 639th year of the 2nd millennium, the 39th year of the 17th century, and the 10th and last year of the 1630s decade. As of the start of 1639, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.

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