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  2. December 18 - Wikipedia

    en.wikipedia.org/wiki/December_18

    December 18 is the 352nd day of the year (353rd in leap years) in the Gregorian calendar; 13 days remain until the end of the year. Events [ edit ] Pre-1600 [ edit ]

  3. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    The Gregorian calendar, like the Julian calendar, is a solar calendar with 12 months of 28–31 days each. The year in both calendars consists of 365 days, with a leap day being added to February in the leap years. The months and length of months in the Gregorian calendar are the same as for the Julian calendar.

  4. Calendar date - Wikipedia

    en.wikipedia.org/wiki/Calendar_date

    The date of a particular event depends on the observed time zone. For example, the air attack on Pearl Harbor that began at 7:48 a.m. Hawaiian time on 7 December 1941 took place at 3:18 a.m. Japan Standard Time, 8 December in Japan. A particular day may be assigned a different nominal date according to the calendar used, so an identifying ...

  5. Julian calendar - Wikipedia

    en.wikipedia.org/wiki/Julian_calendar

    Julian. 11 May 2024. The Julian calendar is a solar calendar of 365 days in every year with an additional leap day every fourth year (without exception). The Julian calendar is still used as a religious calendar in parts of the Eastern Orthodox Church and in parts of Oriental Orthodoxy as well as by the Amazigh people (also known as the Berbers).

  6. Federal holidays in the United States - Wikipedia

    en.wikipedia.org/wiki/Federal_holidays_in_the...

    Juneteenth National Independence Day. Independence Day. Labor Day. Columbus Day. Veterans Day. Thanksgiving Day. Christmas Day. Federal holidays in the United States are 11 calendar dates designated by the U.S. federal government as holidays. On these days non-essential U.S. federal government offices are closed and federal employees are paid ...

  7. December - Wikipedia

    en.wikipedia.org/wiki/December

    December is the twelfth and final month of the year in the Julian and Gregorian calendars. Its length is 31 days. December, from the Très Riches Heures du duc de Berry. December’s name derives from the Latin word decem (meaning ten) because it was originally the tenth month of the year in the calendar of Romulus c. 750 BC, which began in March.

  8. Old Style and New Style dates - Wikipedia

    en.wikipedia.org/wiki/Old_Style_and_New_Style_dates

    The issue spans the changeover; the date heading reads: "From Tuesday September 1, O.S. to Saturday September 16, N.S. 1752". [1] Old Style ( O.S.) and New Style ( N.S.) indicate dating systems before and after a calendar change, respectively. Usually, they refer to the change from the Julian calendar to the Gregorian calendar as enacted in ...

  9. Roman festivals - Wikipedia

    en.wikipedia.org/wiki/Roman_festivals

    The first day of the month was the Kalends (or Calends, from which the English word "calendar" derives). Each Kalends was sacred to Juno , and the Regina sacrorum ("Queen of the Rites," a public priestess) marked the day by presiding over a sacrifice to the goddess.

  10. Aztec calendar - Wikipedia

    en.wikipedia.org/wiki/Aztec_calendar

    These 'extra' days are thought to be unlucky. The year was broken into 18 periods of twenty days each, sometimes compared to the Julian month. The Nahuatl word for moon is metztli but whatever name was used for these periods is unknown. Through Spanish usage, the 20-day period of the Aztec calendar has become commonly known as a veintena.

  11. December solstice - Wikipedia

    en.wikipedia.org/wiki/December_solstice

    Illumination of Earth by the Sun on the day of the December solstice. The December solstice, also known as the southern solstice, is the solstice that occurs each December – typically on 21 December, but may vary by one day in either direction according to the Gregorian calendar. In the Northern Hemisphere, the December solstice is the winter ...