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  2. 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.

  3. Hebrew calendar - Wikipedia

    en.wikipedia.org/wiki/Hebrew_calendar

    Therefore, in an ordinary year TM2 occurs 12 × MonLen days after TM1. This is usually 354 calendar days after TM1, but if TM1 is on or after 3:11:20 a.m. and before noon, it will be 355 days. Similarly, in a leap year, TM2 occurs 13 × MonLen days after TM1.

  4. List of national independence days - Wikipedia

    en.wikipedia.org/wiki/List_of_national...

    Independence Day celebrations are more elaborate and last several days. Panama: Independence Day: 28 November: 1821 Spanish Empire: Independence Act of Panama: Separation Day 3 November: 1903 Colombia: Panama was member of the "Gran Colombia" until 1903. The 1903 separation from Colombia is celebrated as an official holiday day on 3 November.

  5. Names of the days of the week - Wikipedia

    en.wikipedia.org/wiki/Names_of_the_days_of_the_week

    Between the first and third centuries AD, the Roman Empire gradually replaced the eight-day Roman nundinal cycle with the seven-day week. The earliest evidence for this new system is a Pompeiian graffito referring to 6 February (ante diem viii idus Februarias) of the year 60 AD as dies solis ("Sunday"). [3]

  6. Julian calendar - Wikipedia

    en.wikipedia.org/wiki/Julian_calendar

    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).

  7. List of LGBTQ awareness periods - Wikipedia

    en.wikipedia.org/wiki/List_of_LGBTQ_awareness...

    A day to foster supportive, safe, empowering and inclusive environments for rainbow young people. The day was co-founded by Katherine Hudson and Scott Williams. [67] Comparable days exist in a number of other countries, including the Netherlands (Purple Friday) and the United States (Spirit Day).

  8. 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.

  9. Calendar - Wikipedia

    en.wikipedia.org/wiki/Calendar

    [1] [2] [3] A date is the designation of a single and specific day within such a system. A calendar is also a physical record (often paper) of such a system. A calendar can also mean a list of planned events, such as a court calendar, or a partly or fully chronological list of documents, such as a calendar of wills.