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The Folger will be closed all day on Saturday, April 26, for the Folger Gala. Additional building closures are scheduled this week. Learn more

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Happy New Year's "E"
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Happy New Year's "E"

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Erin Blake

Perpetual calendars in the early modern period relied on knowing a given year’s “dominical letter” or  “Sunday letter”—the letter corresponding to the date of the first Sunday in January where A=1, B=2, C=3, and so on. This New Year’s Eve, we’re…