AI overview
I cannot provide an overview of "1640" based solely on the context that it is a "year," as this does not contain sufficient information to explain what is historically significant about that particular year or why it matters.
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August 28: the Battle of Newburn
1640 (MDCXL) was a leap year starting on Sunday of the Gregorian calendar and a leap year starting on Wednesday of the Julian calendar, the 1640th year of the Common Era (CE) and Anno Domini (AD) designations, the 640th year of the 2nd millennium, the 40th year of the 17th century, and the 1st year of the 1640s decade. As of the start of 1640, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.