Dr. Irvin Bromberg of the Univerity of Toronto has developed two leap week calendars called the Symmetry010 Calendar and the Symmetry454 Calendar. The Symmetry010 Calendar uses months with the lengths of 30-31-30–30-31-30–30-31-30–30-31-30/37(ly). The Symmetry454 Calendar has months whose lengths are 28-35-28–28-35-28–28-35-28–28-35-28/35(ly). But, he uses the names of the current months of the Gregorian Calendar for the names of the months in both Symmetry Calendars. This can cause some confusion when trying to determine to which calendar the given date refers. -Walter Ziobro