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  1. 4th October 1582 Pope Gregory XIII implements the Gregorian calendar

    4th October 1582 Pope Gregory XIII implements the Gregorian calendar

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  2. "Leap Day Delights: Unraveling the Mysteries of February 29th"

    "Leap Day Delights: Unraveling the Mysteries of February 29th"

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  4. Leap Day, February 29, a unique occurrence in the Gregorian calendar!

    Leap Day, February 29, a unique occurrence in the Gregorian calendar!

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  6. David Lester Straight - 13 Months / 28 Days Calendar (Julian Calendar)

    David Lester Straight - 13 Months / 28 Days Calendar (Julian Calendar)

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  7. David Lester Straight - Three Frequencies

    David Lester Straight - Three Frequencies

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  8. 4th October 1582 Pope Gregory XIII implements the Gregorian calendar_480p

    4th October 1582 Pope Gregory XIII implements the Gregorian calendar_480p

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