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My local Ace Hardware has a calendar featuring 1958 cars,  The calendar is the same as 2014, 1941, 1947, 1958, 1969, 1975, 1986, 1997, 2003, 2025, etc.

I had nothing to do once, so I reconstructed the perpetual calendar.

There are 14 possible calendars, 7 regular and 7 leap year.  This year, January 1st is on the 4th day of the week, so this year is calendar 4.  Next year is 5, but 2016 is 13, which is like 6 except for the leap day and the successive months.  2017 will not be 7,but will start over at 1.  

The year 2000, like every fourth century year, had a leap day. 1900 didn't.  The leap day is added every 400 years  to keep things straight. 

The Julian calendar, by Julius Caesar, had gotten quite a bit out of whack,  The Gregorian calendar, by Pope Gregory XIII and the astronomy boys, set things straight for centuries to come.  The British were reluctant to adopt such a papist thing, so it wasn't until colonial times that eleven days were taken out of the calendar one year to correct the cumulative error.

i could look it up and see which year the eleven days were deleted, and how this affected George Washington's birthday, but I'll leave that assignment for the class. 

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