Every 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, Tuesday, Wednesday, Thursday, Friday, and Saturday can be found in any of the four heptagrams in a month by advancing two points on the heptagram every time. For example:
- 2014.1.1 is a Sunday and is located on the red heptagram
- Two points further clockwise on the red heptagram week is the date of 2014.1.9 which is a Monday
- The next date in the series is 2014.1.17; Tuesday
- 2014.1.25; Wednesday
- 2014.1.5; Thursday
- 2014.1.13; Friday
- 2014.1.21; Saturday
If you're wondering why you must advance two points in the heptagram week's day to day progression, it will become completely apparent to you upon examining the line heptagram design:
Try viewing the interactive calendar and switching Heptagram Type to "Line" in the settings menu on the right. The line heptagram essentially provides a prediction mechanism for days of the week. By knowing one of the days of the week, you have enough information to name every other day as well.
Regular weeks in the month that do maintain the day-to-day continuum obviously consist of days of all four colors, two days for each of three of the four colors. The fourth color only has a single day in the week. For the first week of 2014, the example week we used above (day zero is not considered to be in a week), purple is the color that only has one day. You will notice that Wednesday, the day in the center of the week, is always the day of the week with the unique color.