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  2. World Calendar - Wikipedia

    en.wikipedia.org/wiki/World_Calendar

    The World Calendar is a 12-month, perennial calendar with equal quarters. [1]Each quarter begins on a Sunday and ends on a Saturday. The quarters are equal: each has exactly 91 days, 13 weeks, or 3 months.

  3. Calendar year - Wikipedia

    en.wikipedia.org/wiki/Calendar_year

    The calendar year can be divided into four quarters, [3] often abbreviated as Q1, Q2, Q3, and Q4. Since they are three months each, they are also called trimesters. In the Gregorian calendar: First quarter, Q1: January 1 – March 31 (90 days or 91 days in leap years) [4] Second quarter, Q2: April 1 – June 30 (91 days)

  4. List of calendars - Wikipedia

    en.wikipedia.org/wiki/List_of_calendars

    This is a list of calendars.Included are historical calendars as well as proposed ones. Historical calendars are often grouped into larger categories by cultural sphere or historical period; thus O'Neil (1976) distinguishes the groupings Egyptian calendars (Ancient Egypt), Babylonian calendars (Ancient Mesopotamia), Indian calendars (Hindu and Buddhist traditions of the Indian subcontinent ...

  5. Calendar reform - Wikipedia

    en.wikipedia.org/wiki/Calendar_reform

    The World Calendar, favored by the UN in the 1950s, and the International Fixed Calendar, quite popular among economists between the World Wars, are proposals that start each year on a Sunday. The 364 days within the week system form 52 weeks of 7 days. The World Calendar has every quarter beginning on the same day of the week.

  6. Academic quarter (year division) - Wikipedia

    en.wikipedia.org/wiki/Academic_quarter_(year...

    This quarter system was adopted by the oldest universities in the English-speaking world (Oxford, founded circa 1096, [1] and Cambridge, founded circa 1209 [2]). Over time, Cambridge dropped Trinity Term and renamed Hilary Term to Lent Term, and Oxford also dropped the original Trinity Term and renamed Easter Term as Trinity Term, thus establishing the three-term academic "quarter" year widely ...

  7. Fiscal Quarters (Q1, Q2, Q3, Q4) Explained and What ... - AOL

    www.aol.com/finance/fiscal-quarters-q1-q2-q3...

    For companies on a calendar quarter, Q2 brings the all-important tax deadline for the prior year of April 15. It also includes the mid-point of the year, which is a great time to look both forward ...

  8. Talk:List of non-standard dates - Wikipedia

    en.wikipedia.org/wiki/Talk:List_of_non-standard...

    There's something called the World Calendar, which has identical quarters (91 days, 13 weeks in each). February has 30 days each year, but it has one peculiarity which ensures it will never catch on - December 31 is outside the week. So Saturday, December 30 (same every year) is followed by a public holiday followed by Sunday, January 1.

  9. Armelin's calendar - Wikipedia

    en.wikipedia.org/wiki/Armelin's_calendar

    Armelin's calendar was developed around 1887 by French astronomer Gaston Armelin [Wikidata], who developed a twelve-month calendar in which the year of 364 days was divided into four equal quarters of 91 days. Armelin's calendar proposal was discussed chiefly under the auspices of the Société astronomique de France in 1887 and recently in the ...