Some calendars with 28 days or 21 days chopped out of each month.
Isn't it interesting that the last days of the month always end up on the same days of the week as the first days of the month?
If you are good at taking numbers modulo 7, these calendars are good enough.
The month of February sometimes entirely disappears.
28-day cuts:
Sun Mon Tue Wed Thu Fri Sat =========================== |1 2 3 |1 |1 2008 |January |Feb|Mar |29 30 31 |29 |29 --------------------------- 2 3 |1 2 |1 2 3 March |April |May 30 31 |29 30 |29 30 31 --------------------------- 1 2 |1 2 3 |1 2 June |July |August 29 30 |29 30 31 |29 30 --------------------------- 3 |1 2 |1 2 3 |1 Aug|Septemb|October |Nov 31 |29 30 |29 30 31 |29 --------------------------- 2 |1 2 3 Nov|December 30 |29 30 31 Sun Mon Tue Wed Thu Fri Sat =========================== |1 2 3 2009 |January |29 30 31 --------------------------- 1 2 3 |1 2 |1 2 March |April |May 29 30 31 |29 30 |29 30 --------------------------- 3 |1 2 |1 2 3 |1 May|June |July |Aug 31 |29 30 |29 30 31 |29 --------------------------- 2 3 |1 2 |1 2 3 August |Septemb|October 30 31 |29 30 |29 30 31 --------------------------- 1 2 |1 2 3 Novembe|December 29 30 |29 30 31
21-day cuts:
Sun Mon Tue Wed Thu Fri Sat =========================== 2008 |January |1 2 3 4 5 --------------------------- January |Februar 6 7 8 9 10 |1 2 --------------------------- February |Mar 3 4 5 6 7 8 |1 --------------------------- March 2 3 4 5 6 7 8 --------------------------- March |April 9 10 |1 2 3 4 5 --------------------------- April |May 6 7 8 9 |1 2 3 --------------------------- May 4 5 6 7 8 9 10 --------------------------- June 1 2 3 4 5 6 7 --------------------------- June |July 8 9 |1 2 3 4 5 --------------------------- July |August 6 7 8 9 10 |1 2 --------------------------- August 3 4 5 6 7 8 9 --------------------------- Aug|September 10 |1 2 3 4 5 6 --------------------------- September |October 7 8 9 |1 2 3 4 --------------------------- October |Nov 5 6 7 8 9 10 |1 --------------------------- November 2 3 4 5 6 7 8 --------------------------- Nov|December 9 |1 2 3 4 5 6 --------------------------- December 7 8 9 10 Sun Mon Tue Wed Thu Fri Sat =========================== 2009 |January |1 2 3 --------------------------- January 4 5 6 7 8 9 10 --------------------------- February 1 2 3 4 5 6 7 --------------------------- March 1 2 3 4 5 6 7 --------------------------- March |April 8 9 10 |1 2 3 4 --------------------------- April |May 5 6 7 8 9 |1 2 --------------------------- May 3 4 5 6 7 8 9 --------------------------- May|June 10 |1 2 3 4 5 6 --------------------------- June |July 7 8 9 |1 2 3 4 --------------------------- July |Aug 5 6 7 8 9 10 |1 --------------------------- August 2 3 4 5 6 7 8 --------------------------- August |September 9 10 |1 2 3 4 5 --------------------------- September |October 6 7 8 9 |1 2 3 --------------------------- October 4 5 6 7 8 9 10 --------------------------- November 1 2 3 4 5 6 7 --------------------------- Novembe|December 8 9 |1 2 3 4 5 --------------------------- December 6 7 8 9 10
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