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The Symmetry010 Calendar (Sym010) is a proposal for Gregorian calendar reform developed by Dr. Irv Bromberg of the University of Toronto, Canada. It is a perpetual solar calendar that conserves the traditional 7-day week, and has symmetrical equal quarters of 30+31+30 days each. Unlike its sibling system and successor, the Symmetry454 Calendar, it does not start every month on Monday, but has month lengths closer to the traditional ones. It is retained as an alternative for those who think that the Sym454 design is too "radical" a departure from the Gregorian calendar format.

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  • Symmetry010 Calendar
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  • The Symmetry010 Calendar (Sym010) is a proposal for Gregorian calendar reform developed by Dr. Irv Bromberg of the University of Toronto, Canada. It is a perpetual solar calendar that conserves the traditional 7-day week, and has symmetrical equal quarters of 30+31+30 days each. Unlike its sibling system and successor, the Symmetry454 Calendar, it does not start every month on Monday, but has month lengths closer to the traditional ones. It is retained as an alternative for those who think that the Sym454 design is too "radical" a departure from the Gregorian calendar format.
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abstract
  • The Symmetry010 Calendar (Sym010) is a proposal for Gregorian calendar reform developed by Dr. Irv Bromberg of the University of Toronto, Canada. It is a perpetual solar calendar that conserves the traditional 7-day week, and has symmetrical equal quarters of 30+31+30 days each. Unlike its sibling system and successor, the Symmetry454 Calendar, it does not start every month on Monday, but has month lengths closer to the traditional ones. It is retained as an alternative for those who think that the Sym454 design is too "radical" a departure from the Gregorian calendar format. In a leap year, the Symmetry010 leap week is either appended to December, making it a 37-day month, or it can stand alone at the end of the year as a 13th "mini-month" that was dubbed "Irvember" by Yoel Berznoger of Toronto. The Symmetry010 calendar is demonstrable in Kalendis by choosing 30+31+30 quarter structure in the Symmetry calendar window. The user can also choose the desired handling of the leap week from the "Symmetry Leap Week" submenu of the "Options" menu. The Sym010 calendar arithmetic is also documented in the public domain, alongside that of the Sym454 calendar. (The last 7 days of December, shown in grey, are intercalary days that are appended only to the end of leap years.)
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