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  2. Presidents' Day - Wikipedia

    en.wikipedia.org/wiki/Presidents'_Day

    Presidents' Day, officially Washington's Birthday at the federal governmental level, is a holiday in the United States celebrated on the third Monday of February. It is often celebrated to honor all those who served as presidents of the United States and, since 1879, has been the federal holiday honoring Founding Father George Washington, who led the Continental Army to victory in the American ...

  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. History of calendars - Wikipedia

    en.wikipedia.org/wiki/History_of_calendars

    The ancient Athenian calendar was a lunisolar calendar with 354-day years, consisting of twelve months of alternating length of 29 or 30 days. To keep the calendar in line with the solar year of 365.242189 days, an extra, intercalary month was added in the years: 3, 6, 8, 11, 14, 17, 19 of the 19-years Metonic cycle.

  5. Dual dating - Wikipedia

    en.wikipedia.org/wiki/Dual_dating

    The need for dual dating arose from the transition from an older calendar to a newer one. Another method used is to give the date of an event according to one calendar, followed in parentheses by the date of the same event in the other calendar, appending an indicator to each to specify which reference calendar applies.

  6. Proleptic Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Proleptic_Gregorian_calendar

    The proleptic Gregorian calendar is produced by extending the Gregorian calendar backward to the dates preceding its official introduction in 1582. In nations that adopted the Gregorian calendar after its official and first introduction, dates occurring in the interim period of 15 October 1582 (the first date of use of Gregorian calendrical dates, being dated 5 October 1582 in the preceding ...

  7. Ianuarius - Wikipedia

    en.wikipedia.org/wiki/Ianuarius

    Ianuarius, Januarius, or January, fully Mensis Ianuarius ("month of Janus") and abbreviated Ian., was the first month of the ancient Roman calendar, from which the Julian and Gregorian month of January derived.

  8. Nor-Shipping - Wikipedia

    en.wikipedia.org/wiki/Nor-Shipping

    Nor-Shipping is a maritime trade fair that has been held in Norway biennially since 1965. It is one of the leading international shipping events and an important meeting place and forum for the shipping industry. It "remains one of the most pivotal and well-attended events of the marine and offshore calendar."

  9. Hanke–Henry Permanent Calendar - Wikipedia

    en.wikipedia.org/wiki/Hanke–Henry_Permanent...

    Hanke–Henry Permanent Calendar pre-2016 version with weeks still starting Sunday, but Xtra already at the end of the year. In 2004, Richard Conn Henry, a professor of astronomy at Johns Hopkins University, proposed the adoption of a calendar known as Common-Civil-Calendar-and-Time (CCC&T), which he described as a modification to a proposal by Robert McClenon.