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  2. History of calendars - Wikipedia

    en.wikipedia.org/wiki/History_of_calendars

    The history of calendars covers practices with ancient roots as people created and used various methods to keep track of days and larger divisions of time. Calendars commonly serve both cultural and practical purposes and are often connected to astronomy and agriculture . Archeologists have reconstructed methods of timekeeping that go back to ...

  3. 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. The three months in each quarter have 31, 30, and 30 days respectively. Each quarter begins with the 31-day months of January, April, July ...

  4. Timelines of world history - Wikipedia

    en.wikipedia.org/wiki/Timelines_of_world_history

    These timelines of world history detail recorded events since the creation of writing roughly 5000 years ago to the present day. For events from c. 3200 BC – c. 500 see: Timeline of ancient history. For events from c. 500 – c. 1499, see: Timeline of post-classical history. For events from c. 1500, see: Timelines of modern history.

  5. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    The Gregorian calendar is the calendar used in most parts of the world. [1] [a] It went into effect in October 1582 following the papal bull Inter gravissimas issued by Pope Gregory XIII , which introduced it as a modification of, and replacement for, the Julian calendar .

  6. 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 ...

  7. Adoption of the Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Adoption_of_the_Gregorian...

    The adoption of the Gregorian Calendar was an event in the early modern history of most cultures and societies, marking a change from their traditional (or "old style") dating system to the modern (or "new style") dating system – the Gregorian calendar – that is widely used around the world today. Some states adopted the new calendar from ...

  8. List of month-long observances - Wikipedia

    en.wikipedia.org/wiki/List_of_month-long_observances

    June. African-American Music Appreciation Month [28] [29] ALS Awareness Month (Canada) Caribbean-American Heritage Month [30] LGBT Pride Month. National PTSD Awareness Day [31] National Safety Month [32] National Smile Month (United Kingdom, May and June) Devotion to the Sacred Heart.

  9. Ussher chronology - Wikipedia

    en.wikipedia.org/wiki/Ussher_chronology

    Ussher chronology. The Ussher chronology is a 17th-century chronology of the history of the world formulated from a literal reading of the Old Testament by James Ussher, the Archbishop of Armagh and Primate of All Ireland. The chronology is sometimes associated with young Earth creationism, which holds that the universe was created only a few ...