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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. 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 ...

  4. Category:Specific calendars - Wikipedia

    en.wikipedia.org/wiki/Category:Specific_calendars

    World Calendar; X. Xhosa calendar; Y. Yoruba calendar; Z. Zoroastrian calendar; Zulu calendar This page was last edited on 10 October 2020, at 23:03 (UTC). Text is ...

  5. History of calendars - Wikipedia

    en.wikipedia.org/wiki/History_of_calendars

    [clarification needed] [7] The site is found near the world's oldest known site of permanent aquaculture. A mesolithic arrangement of twelve pits and an arc found in Warren Field, Aberdeenshire, Scotland, dated to roughly 8,000 BC, has been described as a lunar calendar and was dubbed the "world's oldest known calendar" in 2013. [8]

  6. Category:Calendars - Wikipedia

    en.wikipedia.org/wiki/Category:Calendars

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us

  7. 2025 - Wikipedia

    en.wikipedia.org/wiki/2025

    January 10 – The European Copernicus Climate Change Service reports that 2024 was the world's hottest year on record, and the first calendar year to pass the symbolic threshold of 1.5°C of global warming. [21] January 11 – A gas station explosion in al-Bayda, Yemen, results in 40 deaths and dozens of others injured. [22]

  8. Elisabeth Achelis - Wikipedia

    en.wikipedia.org/wiki/Elisabeth_Achelis

    She was taken by the idea of calendar reform but was appalled by the strict rigidity of the 28-day month, 13-month system. [7] Achelis founded The World Calendar Association (TWCA) in 1930, in direct opposition to Cotsworth's International Fixed Calendar League, with the goal of worldwide adoption of the World Calendar.

  9. Calendar - Wikipedia

    en.wikipedia.org/wiki/Calendar

    In a solar calendar a year approximates Earth's tropical year (that is, the time it takes for a complete cycle of seasons), traditionally used to facilitate the planning of agricultural activities. In a lunar calendar, the month approximates the cycle of the moon phase. Consecutive days may be grouped into other periods such as the week.