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The Symmetry454 Calendar (Sym454) is a proposal for calendar reform. It is a perennial solar calendar that conserves the traditional 7-day week, has symmetrical equal quarters, and starts every month on Monday. == Calendar year == The proposed calendar is laid out as follows: | |- !style="color:white;background:green"| 2nd | | | |- !style="color:white;background:red"| 3rd | | | |- !style="color:black;background:orange"| 4th | | | |} : The last 7 days of December, shown in grey, are intercalary days that are appended only to the end of leap years. The idea of months having 4 or 5 whole weeks is not new, having been proposed in the 1970s by Chris Carrier for the Bonavian Civil Calendar and by Joseph Shteinberg for his "Calendar Without Split Weeks". Whereas the former has 5 + 4 + 4 weeks per quarter, and the latter has 4 + 4 + 5 weeks per quarter, the Symmetry454 Calendar has a ''symmetrical'' 4 + 5 + 4 weeks per quarter, which is why it is named Symmetry454. (Note that there is no space between "Symmetry" and "454".) Balanced quarters are desirable for businesses because they aid in fiscal planning and analysis. All months have a whole number of weeks, so no month ever has a partial week. Each day number within a month falls on the same weekday in all months and years; in particular, Friday the 13th never occurs under this calendar. All holidays, birthdays, anniversaries, etc. are permanently fixed. All ordinal day and week numbers within the year are also permanently fixed. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Symmetry454」の詳細全文を読む スポンサード リンク
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