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  2. Perpetual calendar - Wikipedia

    en.wikipedia.org/wiki/Perpetual_calendar

    A perpetual calendar employs a table for finding which of fourteen yearly calendars to use. A table for the Gregorian calendar expresses its 400-year grand cycle: 303 common years and 97 leap years total to 146,097 days, or exactly 20,871 weeks. This cycle breaks down into one 100-year period with 25 leap years, making 36,525 days, or one day ...

  3. Calendar year - Wikipedia

    en.wikipedia.org/wiki/Calendar_year

    The Lunar Hijri calendar is a lunar calendar consisting of 12 months in a year of 354 or 355 days. The astronomer's mean tropical year, which is averaged over equinoxes and solstices, is currently 365.24219 days, slightly shorter than the average length of the year in most calendars. A year can also be measured by starting on any other named ...

  4. Timeline of the COVID-19 pandemic in the United States (2020)

    en.wikipedia.org/wiki/Timeline_of_the_COVID-19...

    By late November 2019, coronavirus disease 2019 had broken out in Wuhan, China. [2]As reported in Clinical Infectious Diseases on November 30, 2020, 7,389 blood samples collected between December 13, 2019, and January 17, 2020, by the American Red Cross from normal donors in nine states (California, Connecticut, Iowa, Massachusetts, Michigan, Oregon, Rhode Island, Washington and Wisconsin ...

  5. Pax Calendar - Wikipedia

    en.wikipedia.org/wiki/Pax_Calendar

    13. Pax (leap week) 7. 13/14. December. 28. The common year is divided into 13 months of 28 days each, whose names are the same as in the Gregorian calendar, except that a month called Columbus occurs between November and December. The first day of every week, month and year would be Sunday. Unlike other perennial calendar reform proposals ...

  6. Pirelli Calendar - Wikipedia

    en.wikipedia.org/wiki/Pirelli_Calendar

    The Pirelli Calendar, known and trade-marked as "The Cal", is an annual trade calendar which has been published by the UK subsidiary of the Italian tyre manufacturing company Pirelli since 1964. The calendar has a reputation for its choice of photographers and models and featured glamour photography from the 1980s until the 2010s.

  7. Timeline of the COVID-19 pandemic - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_the_COVID-19...

    The first human case in the United States was on 21 January 2020. The World Health Organization declared the COVID-19 outbreak a Public Health Emergency of International Concern (PHEIC) on 30 January 2020, and first referred to it as a pandemic on 11 March 2020. [3] [4] The WHO ended the PHEIC on 5 May 2023. [5]

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