Each year consists of 13 weeks of each color summing to 52 weeks (and 1 day). Each 4 year* leap day cycle read more...
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Leap Day Notation Has Been Changed
published 2012.4.28
(April 11, 2012)
The notation of the leap day has been changed from xxxx.0.13 to xxxx.0.4. This is because the leap day rule is based on the number 4. In fact, it can be thought of as an extension of the 4x13 pattern of weeks. -
The Heptagram Week
published 2012.4.24
(April 7, 2012)
Heptagram WeeksEvery 28 day month on the calendar has four heptagrams, one for each calendar color. A heptagram week is the seven day cycle that occurs on a single heptagram over the course of the month. Every day on the heptagram week is three days apart from every other day.
The pattern of Sunday, Monday, read more...
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Equinoxes and Solstices
published 2012.4.17
(March 31, 2012)
Ideally, the equinoxes and solstices would be appear on the calendar as a month-day alignment exactly on the top, right, bottom, and left positions. This, however, would not be possible for a static calendar as the days of the equinoxes and soltices vary a little bit.It turns out the top, right, bottom, and left read more...
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Month-Day Alignments and the Enneagram
published 2012.4.13
(March 27, 2012)
Digital Roots and the Number NineThe month-day alignments are those twelve days on the calendar where the day circle is in the center of the month circle. The thirteenth month lies in the center of the calendar and therefore does not have a month-day alignment. These twelve dates are:
1.1
2.3 read more...
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Welcome
published 2012.4.9
(March 23, 2012)
Welcome to Calendar 13, a website devoted to a version of the 13 month, 28 day calendar developed by me (Cody Jassman).It is a free concept for anyone's use or adaption as it is itself a borrowed idea. It is based on the 13 month, 28 day diagram created by John Michell in his book “The Dimensions of Paradise”. read more...