Editing World Season Calendar

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.

{| class="wikitable"
|+Season
|-
! title="Sunday" | Sun
! title="Monday" | Mon
! title="Tuesday" | Tue
! title="Wednesday" | Wed
! title="Thursday" | Thu
! title="Friday" | Fri
! title="Saturday" | Sat
|-
| 01 || 02 || 03 || 04 || 05 || 06 || 07
|-
| 08 || 09 || 10 || 11 || 12 || 13 || 14
|-
| 15 || 16 || 17 || 18 || 19 || 20 || 21
|-
| 22 || 23 || 24 || 25 || 26 || 27 || 28
|-
| 29 || 30 || 31 || 32 || 33 || 34 || 35
|-
| 36 || 37 || 38 || 39 || 40 || 41 || 42
|-
| 43 || 44 || 45 || 46 || 47 || 48 || 49
|-
| 50 || 51 || 52 || 53 || 54 || 55 || 56
|-
| 57 || 58 || 59 || 60 || 61 || 62 || 63
|-
| 64 || 65 || 66 || 67 || 68 || 69 || 70
|-
| 71 || 72 || 73 || 74 || 75 || 76 || 77
|-
| 78 || 79 || 80 || 81 || 82 || 83 || 84
|-
| 85 || 86 || 87 || 88 || 89 || 90 || 91
|}

The seasons of the year are named A, B, C, and D; they correspond to the traditional four astronomical seasons.

{| class="wikitable"
|+Seasons
|-
! WSC !! Northern hemisphere !! Southern hemisphere
|-
! A
| Winter || Summer
|-
! B
| Spring || Autumn
|-
! C
| Summer || Winter
|-
! D
| Autumn || Spring
|}

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 &times; 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.

{| class="wikitable" style="text-align:center"
|+Examples
|-
! Gregorian !! World Season
|-
| January 1 || A-12
|-
|April 1
|B-11 or B-12
|-
| July 1 || C-11
|-
|September 1
|C-73
|-
| December 1 || D-73
|-
| December 21 || A-1
|}

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.

==Notes==
* Asimov, Isaac. ''The Tragedy of the Moon''. Pages 48–58. Doubleday and Co.: 1973. ISBN 0-440-18999-3.

==External links==
* [http://www.davidgsimpson.com/ref/ws.pdf World Season Calendar conversion charts]

{{Template:Wikipedia}}
[[Category:Proposed calendars]]
[[Category:Equal-quarter calendars]]
[[Category:Days outside the week cycle]]
[[Category:Week starts Sunday]]
[[Category:4-season calendar]]
[[Category:Fictional calendars]]
[[Category:365+1]]
[[Category:Perpetual calendars]]
[[Category:Mid-of-year leap]]
[[Category:Astronomic year start]]
[[Category:Northern_winter_solstice_start]]