[tzs]

A season-based calendar, The World Season Calendar, was proposed by Isaac Asimov.

It consisted of four seasons, named A, B, C, and D, corresponding to Winter/Spring/Summer/Autumn in the Northern Hemisphere and Summer/Autumn/Winter/Spring in the Southern Hemisphere.

Each season looked like this:

  Sun Mon Tue Wed Thu Fri Sat
   01  02  03  04  05  06  07
   08  09  10  11  12  13  14
   ...
   85  86  87  88  89  90  91

That gives 91 x 4 = 364 days.

An extra day, called Year Day, occurs between D 91 and A 01 of the next year, and is not part of the 7 day week cycle. In leap years another extra day, also outside the week cycle, called Leap Day is added between B 91 and C 01.