Gregorian Calendar

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The Gregorian calendar is the calendar widely used in the Western world. A modification of the Julian calendar, it was first proposed by the Neapolitan doctor Aloysius Lilius, and was decreed by Pope Gregory XIII, for whom it was named, on 24 February 1582 (Note: The papal bull Inter gravissimas was signed in the year 1581 for unknown reasons, but printed on 1 March in 1582. But other contemporaneous papal bulls have years that do not agree with March years, let alone papal years or other types of years.)

The Gregorian calendar was devised because the mean year in the Julian Calendar was a little too long, causing the Vernal equinox to slowly drift earlier in the calendar year.

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These are the Twelve Months of the Nanakshahi Calendar
1 2 3 4 5 6 7 8 9 10 11 12
Chet Vaisakh Jeth Harh Sawan Bhadon Assu Katak Maghar Poh Magh Phagun