The World Season Calendar is a proposal for calendar reform by author Isaac Asimov. In this calendar, the year is divided into four seasons of 13 weeks each. The calendar for each season always has the following form: The seasons of the year are named A, B, C, and D; they correspond to the following seasons: December 21, which is on or near the time of the northern winter solstice on the Gregorian calendar, is called A-1 on the World Season Calendar.

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  • The World Season Calendar is a proposal for calendar reform by author Isaac Asimov. In this calendar, the year is divided into four seasons of 13 weeks each. The calendar for each season always has the following form: The seasons of the year are named A, B, C, and D; they correspond to the following seasons: December 21, which is on or near the time of the northern winter solstice on the Gregorian calendar, is called A-1 on the World Season Calendar. Since each of the four seasons contains 91 days, there are 91 × 4 = 364 days in all four seasons. To make 365 days, an extra day called Year Day is added at the end of season D. Year Day is day D-92, and is not assigned a day of the week. During leap year, an extra day called Leap Day is added at the end of season B. Leap Day, when it occurs, is day B-92, and is not assigned a day of the week. | January 1 || A-12 | April 1 || B-11* | July 1 || C-11ber 1 || D-73 | December 21 || A-1 *B-12 during leap year.
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  • The World Season Calendar is a proposal for calendar reform by author Isaac Asimov. In this calendar, the year is divided into four seasons of 13 weeks each. The calendar for each season always has the following form: The seasons of the year are named A, B, C, and D; they correspond to the following seasons: December 21, which is on or near the time of the northern winter solstice on the Gregorian calendar, is called A-1 on the World Season Calendar.
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  • World Season Calendar
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