The World Season Calendar (WSC) is a proposal for calendar reform by author Isaac Asimov. In this calendar, the year is divided into four seasons of thirteen weeks each.
The seasons of the year are named A, B, C, and D; they correspond to the traditional four astronomical seasons.
|WSC||Northern hemisphere||Southern hemisphere|
Since each of the four seasons contains 91 days, there are 91 × 4 = 364 days across 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.
|April 1||B-11 or B-12|
Dates from March 1 to June 20 occur one day later in the World Season Calendar in a leap year compared to a common year, hence April 1, which occurs on B11 in a common year, occurs on B12 in a leap year.
- Asimov, Isaac. The Tragedy of the Moon. Pages 48–58. Doubleday and Co.: 1973. ISBN 0-440-18999-3.
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