Karl Palmen's Playing Card Calendar
I've looked at various perpetual calendars that preserve the existing 7 day week, many of which are shown in the calendar reform page. From this, I've come to the conclusion that it would be best to do away with months or second best have months with 4 or 5 whole weeks. If there are no months, then months could be used for a pure lunar calendar, such as my Yerm Lunar Calendar.
Weeks could simply be numbered from 1 to 52 or 53 as with the ISO week numbers. But I find this rather dull, so I brightened it up by using playing cards to represent the weeks. This also enables the suits to represent quarters.
For those who object to playing cards, the quarters and weeks could be given some other name. But playing cards are so familiar that they could form a practical naming system.
I've chosen the suits to be in alphabetical order
Clubs, Diamonds, Hearts, Spades.
In the ISO Deck of the calendar, the cards correspond to the ISO week numbers.
Other decks could be defined for other leapweek rules.
The correspondence between week number and playing card weeks is as shown below:Clubs Diamonds Hearts Spades Ace 01 14 27 40 Two 02 15 28 41 Three 03 16 29 42 Four 04 17 30 43 Five 05 18 31 44 Clubs Diamonds Hearts Spades Six 06 19 32 45 Seven 07 20 33 46 Eight 08 21 34 47 Nine 09 22 35 48 Ten 10 23 36 49 Clubs Diamonds Hearts Spades Jack 11 24 37 50 Queen 12 25 38 51 King 13 26 39 52 Joker 53
Wednesday ISO week 34, therefore
Wednesday Eight of Hearts (ISO Deck)
I've since found a different playing card calendar at
(a nice big graphic shows the year-circle of cards)
It uses Jokers to increase the number of days in a year from 364 to 365 or 366 rather than to provide a 53rd week.
It has been extended to be a lunisolar calendar. Unfortunately, (as of 2001-01-15) the arithmetic is incorrect and the lunar month drifts one week earlier each Metonic cycle
(19 years = 988 weeks, 235 months = 987 weeks).
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