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  2. Igbo calendar - Wikipedia

    en.wikipedia.org/wiki/Igbo_calendar

    The Igbo calendar ( Igbo: Ògụ́àfọ̀ Ị̀gbò[citation needed]) is the traditional calendar system of the Igbo people from present-day Nigeria. The calendar has 13 months in a year ( afo ), 7 weeks in a month ( onwa ), and 4 days of Igbo market days (afor, nkwo, eke, and orie) in a week ( izu) plus an extra day at the end of the year, in ...

  3. Mathematics in Ethiopia - Wikipedia

    en.wikipedia.org/wiki/Mathematics_in_Ethiopia

    The Ethiopian calendar has a leap year every four years, without exception, while the Gregorian calendar has a leap year every four years except centennial years not divisible by 400. Thus, the date difference between the two calendars increases by about one day per century (or more precisely, one day per non-quadcentennial century).

  4. History of calendars - Wikipedia

    en.wikipedia.org/wiki/History_of_calendars

    Calendars are explicit schemes used for timekeeping. The first historically attested and formulized calendars date to the Bronze Age, dependent on the development of writing in the ancient Near East. In 2000 AD, Victoria, Australia, a Wurdi Youang stone arrangement could date back more than 11,000 years. [1]

  5. Ethiopian Patriots' Victory Day - Wikipedia

    en.wikipedia.org/wiki/Ethiopian_Patriots'_Victory...

    Annual. The Ethiopian Patriots' Victory Day ( Amharic: የአርበኞች ድል ቀን ), also called Meyazia 27, [1] is a national holiday in Ethiopia celebrating on 5 May in commemoration of the Ethiopian resistance movement Arbegnoch victory over Italian five years occupation of Ethiopia, and the return of Emperor Haile Selassie to the ...

  6. Old Style and New Style dates - Wikipedia

    en.wikipedia.org/wiki/Old_Style_and_New_Style_dates

    The issue spans the changeover; the date heading reads: "From Tuesday September 1, O.S. to Saturday September 16, N.S. 1752". [1] Old Style ( O.S.) and New Style ( N.S.) indicate dating systems before and after a calendar change, respectively. Usually, they refer to the change from the Julian calendar to the Gregorian calendar as enacted in ...

  7. Xhosa calendar - Wikipedia

    en.wikipedia.org/wiki/Xhosa_calendar

    The Xhosa year traditionally begins in June and ends in May when the brightest star visible in the Southern Hemisphere, Canopus, signals the time for harvesting. In urban areas today, anglicized versions of the months are used, especially by the younger generation, but in the rural areas of the Eastern Cape, the old names still stand.