The beginning date, July 26, corresponds to the heliacal rising of Sirius, making the 13 Moon 28-day cycle a solar/galactic calendar. The 13 Moon calendar is a perfect harmonious 13-month (moon) cycle of 28 days each. Its harmony is visible when we view it next to the Gregorian calendar. In the Gregorian calendar there is very little cyclic or periodic order. Months are uneven, the length of the month does not correlate with the seven-day week, and the days of the week and their numbers change every month.
With the 13 Moon calendar, everything is very even, orderly and harmonic so you can't get lost in time. The Haab and Tun Uc calendars of the Mayans and the calendar of Thoth in ancient Egypt also began on the day July 26th. The Haab is eighteen 20-day vinal cycles, plus the 5-day uayeb. The Tun Uc is literally the count of seven - this is the 13 Moon 28-day cycle. The calendar of Thoth was also a 13 moon, 28-day cycle. These are all solar measures. The original Druid calendar was a 13 Moon 28-day cycle and the Andean (Incan) Pachacuti, in use for 5,000 years, is also 13 Moons of 28 days. Other cultures that use a 13 Moon 28-day calendar include Polynesians, Native Americans, Chinese and Essenes.
All calendar systems can be synchronized into the 13:20 matrix.