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  2. Undecimber - Wikipedia

    en.wikipedia.org/wiki/Undecimber

    In the Java Platform, Standard Edition, the java.util.Calendar class includes support for calendars which permit thirteen months. [8] Although the Gregorian calendar used in most parts of the world includes only twelve months, there exist some lunar calendars that are divided into synodic months, with an intercalary or "leap" month added in some years.

  3. International Fixed Calendar - Wikipedia

    en.wikipedia.org/wiki/International_Fixed_Calendar

    The International Fixed Calendar (also known as the Cotsworth plan, the Cotsworth calendar, the Eastman plan or the Yearal) [1] was a proposed reform of the Gregorian calendar designed by Moses B. Cotsworth, first presented in 1902. [2] The International Fixed Calendar divides the year into 13 months of 28 days each.

  4. Ethiopian calendar - Wikipedia

    en.wikipedia.org/wiki/Ethiopian_Calendar

    The Ethiopian calendar has twelve months, all thirty days long, and five or six epagomenal days, which form a thirteenth month. [2] [3] The Ethiopian months begin on the same days as those of the Coptic calendar, but their names are in Geʽez. A sixth epagomenal day is added every four years, without exception, on 29 August of the Julian ...

  5. Chinese calendar - Wikipedia

    en.wikipedia.org/wiki/Chinese_calendar

    The name of calendar is in Chinese: ... Months begin on the day of the new moon, and a year has 12 or 13 months. Intercalary months (a 13th month) are added to the ...

  6. Why is Friday the 13th unlucky? The cultural origins of an ...

    www.aol.com/why-friday-13th-unlucky-cultural...

    While Friday the 13th may feel like a rare phenomenon, our Gregorian calendar means that the 13th of any month is slightly more likely to fall on a Friday than any other day of the week.

  7. When is the next Friday the 13th and what year has 3 of them?!

    www.aol.com/next-friday-13th-3-them-152204911.html

    Friday the 13th will occur three times in the year, including in back-to-back months: Feb. 13 (you might not want to celebrate Valentine's Day a little early) March 13. Nov. 13.

  8. 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 ...

  9. There Will Be a Friday the 13th in October, Truly Making It ...

    www.aol.com/lifestyle/friday-13th-october-truly...

    Friday the 13th is considered one of the unluckiest days of the years. The next Friday the 13th is October 13, 2023. Here's why it's associated with bad luck.