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  2. Perpetual calendar - Wikipedia

    en.wikipedia.org/wiki/Perpetual_calendar

    Perpetual calendar designers hide the complexity in tables to simplify their use. 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.

  3. Wikipedia talk : Age calculation templates

    en.wikipedia.org/wiki/Wikipedia_talk:Age...

    Correct me if I'm wrong, but from what I've just been reading at List of longest-reigning British monarchs, List of longest reigning monarchs of all time, Template:Age in years and days, Template:Age in days, Template:Gregorian serial date, and here, there is probably quite a bit of inaccuracy spread throughout Wikipedia wherever editors are ...

  4. Determination of the day of the week - Wikipedia

    en.wikipedia.org/wiki/Determination_of_the_day...

    Take the given date in 4 portions, viz. the number of centuries, the number of years over, the month, the day of the month. Compute the following 4 items, adding each, when found, to the total of the previous items. When an item or total exceeds 7, divide by 7, and keep the remainder only.

  5. International Fixed Calendar - Wikipedia

    en.wikipedia.org/wiki/International_Fixed_Calendar

    The calendar year has 13 months with 28 days each, divided into exactly 4 weeks (13 × 28 = 364). An extra day added as a holiday at the end of the year (after December 28, i.e. equal to December 31 Gregorian), sometimes called "Year Day", does not belong to any week and brings the total to 365 days.

  6. Rolex Day-Date - Wikipedia

    en.wikipedia.org/wiki/Rolex_Day-Date

    The Rolex Oyster Perpetual Day-Date is a COSC certified, self-winding chronometer manufactured by Rolex. Initially presented in 1956, the Day-Date was the first watch to display the date as well as the day, spelled in full. [ 1 ]

  7. Perennial calendar - Wikipedia

    en.wikipedia.org/wiki/Perennial_calendar

    The term perennial calendar appeared as early as 1824, in the title of Thomas Ignatius Maria Forster's Perennial calendar and companion to the almanack. [1] In that work he compiled "the events of every day in the year, as connected with history, chronology, botany, natural history, astronomy, popular customs and antiquities, with useful rules of health, observations on the weather ...

  8. List of living centenarians - Wikipedia

    en.wikipedia.org/wiki/List_of_living_centenarians

    First Lady of Greece; ex-wife of Prime Minister of Greece Andreas Papandreou, women's rights activist, writer, author and columnist [198] Mary Morello: F: October 1, 1923: 101 years, 110 days: American: Free speech activist [199] Surindra Nath Sharma: M: October 3, 1923: 101 years, 108 days: Indian: Army general and military engineer [200 ...

  9. List of American supercentenarians - Wikipedia

    en.wikipedia.org/wiki/List_of_American_super...

    In 1918, after graduating from Adams High School, [69] [70] she responded to government drives to recruit women into employment during WWI, and moved to Washington, D.C. [67] After the war, she worked as a secretary for the Department of the Treasury and the Veterans Administration. [71]

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