Was it REALLY necessary to drop those 10 days in 1582 ?!?
  Pope Gregory XIII's ruling that dropped the 10 days in 1582 was not a popular move with many people, particularly
  businessmen. Some papal advisors suggested that the Gregorian Calendar be phased in over a given period, but Pope
  Gregory ruled that the revised calendar was to be put in place right away.
     

  Now, let us suppose that a phase-in period of some kind had been ordered. Presented below, along with the actual
  sequence of events, are two possible alternative scenarios.

             
  A: Actual Year Calendar Sequence (1580-1629) as ordered by Pope Gregory XIII
              
     1580 - 13   1590 -  2   1600 - 14   1610 -  6   1620 - 11    In 1582, Year Calendar-2 is used up thru
     1581 -  1   1591 -  3   1601 -  2   1611 -  7   1621 -  6    October 4th,  when Pope Gregory XIII orders
     1582 - 2/6  1592 - 11   1602 -  3   1612 -  8   1622 -  7    the next 10 days dropped.
     1583 -  7   1593 -  6   1603 -  4   1613 -  3   1623 -  1
     1584 -  8   1594 -  7   1604 - 12   1614 -  4   1624 -  9
     1585 -  3   1595 -  1   1605 -  7   1615 -  5   1625 -  4    Thus, October 15th becomes the first day after
     1586 -  4   1596 -  9   1606 -  1   1616 - 13   1626 -  5    October 4th. Year Calendar-6 is used from this
     1587 -  5   1597 -  4   1607 -  2   1617 -  1   1627 -  6    point to the end of 1582.
     1588 - 13   1598 -  5   1608 - 10   1618 -  2   1628 - 14
     1589 -  1   1599 -  6   1609 -  5   1619 -  3   1629 -  2    The Gregorian Calendar has arrived !!!!



  B: Alternative Year Calendar Sequence (1580-1629) if Leap Day February 29 is omitted every 4 years from 1584 to 1620
             
     1580 - 13   1590 -  3   1600 -  6   1610 -  2   1620 -  5    In Sequence B, no days are removed from 1582,
     1581 -  1   1591 -  4   1601 -  7   1611 -  3   1621 -  6    and the observance of Leap Year and February
     1582 -  2   1592 -  5   1602 -  1   1612 -  4   1622 -  7    29th is put aside from 1584 to 1620.
     1583 -  3   1593 -  6   1603 -  2   1613 -  5   1623 -  1
     1584 -  4   1594 -  7   1604 -  3   1614 -  6   1624 -  9
     1585 -  5   1595 -  1   1605 -  4   1615 -  7   1625 -  4    Beginning 1621, Sequence B is equal with Sequence A
     1586 -  6   1596 -  2   1606 -  5   1616 -  1   1626 -  5    above. Leap Year Observance is restored, beginning
     1587 -  7   1597 -  3   1607 -  6   1617 -  2   1627 -  6    1624, and now the Gregorian Calendar is firmly in place.
     1588 -  1   1598 -  4   1608 -  7   1618 -  3   1628 - 14    
     1589 -  2   1599 -  5   1609 -  1   1619 -  4   1629 -  2



  C: Alternative Year Calendar Sequence (1580-1629) - Transition from Julian to Gregorian in nine years.
              
     1580 - 13   1590 - 3/2  1600 - 14   1610 -  6   1620 - 11    In Sequence C, no days are removed from 1582.
     1581 -  1   1591 -  3   1601 -  2   1611 -  7   1621 -  6
     1582 -  2   1592 - 11   1602 -  3   1612 -  8   1622 -  7    From 1583 to 1590, Year Calendar-3 is used up to July
     1583 - 3/2  1593 -  6   1603 -  4   1613 -  3   1623 -  1    30th. The 31st of July is not observed. Year Calendar-2
     1584 - 3/2  1594 -  7   1604 - 12   1614 -  4   1624 -  9    is then used for the remainder of the year. Also, in
     1585 - 3/2  1595 -  1   1605 -  7   1615 -  5   1625 -  4    both 1584 and 1588, February 29th is not observed. As
     1586 - 3/2  1596 -  9   1606 -  1   1616 - 13   1626 -  5    a result each year from 1583 to 1590 is exactly 364 days,
     1587 - 3/2  1597 -  4   1607 -  2   1617 -  1   1627 -  6    with January 1st always starting on a Tuesday. In 1591,
     1588 - 3/2  1598 -  5   1608 - 10   1618 -  2   1628 - 14    Year Calendar-3 is observed for the full year, and now
     1589 - 3/2  1599 -  6   1609 -  5   1619 -  3   1629 -  2    the Gregorian Calendar is firmly in place.    

     The 3/2 Split Year Calendar for 1583 to 1590



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