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  2. viral On This Day 4 October 1582 The Gregorian Calendar Was Adopted

    viral On This Day 4 October 1582 The Gregorian Calendar Was Adopted

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  3. viral On This Day 4 October 1582 The Gregorian Calendar Was Adopted

    viral On This Day 4 October 1582 The Gregorian Calendar Was Adopted

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  4. 4th October 1582 Pope Gregory XIII implements the Gregorian calendar

    4th October 1582 Pope Gregory XIII implements the Gregorian calendar

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