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Speculative theory
Thirteen Month CalendarAtlas
Conventions & Standards · Timekeeping & calendars
Calendar reform literature has included affirmative discussion of adopting a thirteen-month year structure. Some religious calendar teachings contrast twelve-month and thirteen-month year models and present a thirteen-month pattern as tied to a creation or scriptural calendar.
Open the caseThirteen-month calendar2
- Documented · Thirteen-month calendar proposals appear in historical calendar-reform debate materials rather than only as a single modern invention.
- Documented · Wikisource hosts a compiled work and related discussion pages under the title Thirteen-Month Calendar, including sections on calendar reform and a brief chronology of calendar periods and reform movements.
Calendar reform1
- Documented · Calendar reform literature has included affirmative discussion of adopting a thirteen-month year structure.
Julia E. Johnsen1
- Documented · Julia E. Johnsen is credited as author of a work titled Thirteen-month calendar, catalogued on Open Library.
Leonard Everett Fisher1
- Documented · Leonard Everett Fisher produced a book titled Calendar art that presents thirteen days, weeks, months, and years drawn from calendars around the world.
Other3
- Documented · Popular and cultural writing associates Ethiopia with the phrase living thirteen months of sunshine in reference to its calendar.
- Documented · The Ethiopian (Amharic) civil calendar is described as including thirteen months.
- Contested · Some religious calendar teachings contrast twelve-month and thirteen-month year models and present a thirteen-month pattern as tied to a creation or scriptural calendar.