Usually 91 days or 13 weeks, often divided into 4 months.
“The World Season Calendar (WSC) is a proposal for calendar reform by author Isaac Asimov. In...World Season Calendar
“To make a calendar based on the numbering of weeks such as ISO week more interesting, the weeks...Playing Card Calendar
“This calendar may have used a cycle of 294 years of 364 days (52 weeks) reckoned to equal 293...Qumran Calendar
“Each quarter has 3 months, with the following lengths: 30 days, 30 days,& 31 days, in that...30,30,31 Ossipoff Minimum-Displacement
“The Bonavian Civil calendar is a calendar reform proposed by Chris Carrier. Every month begins...Bonavian Civil Calendar
“The Earth Calendar is a reform of the Gregorian Calendar developed and proposed by Brij Bhushan...Earth Calendar
This category has the following 4 subcategories, out of 4 total.
Pages in category "Equal-quarter calendars"
The following 21 pages are in this category, out of 21 total.