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  2. Knuckle mnemonic - Wikipedia

    en.wikipedia.org/wiki/Knuckle_mnemonic

    One form of the mnemonic is done by counting on the knuckles of one's hand to remember the number of days in each month. [1] Knuckles are counted as 31 days, depressions between knuckles as 30 (or 28/29) days. One starts with the little finger knuckle as January, and one finger or depression at a time is counted towards the index finger knuckle ...

  3. 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.

  4. 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.

  5. Lunar calendar - Wikipedia

    en.wikipedia.org/wiki/Lunar_calendar

    Since each lunation is approximately 29 + 1 ⁄ 2 days, [1] it is common for the months of a lunar calendar to alternate between 29 and 30 days. Since the period of 12 such lunations, a lunar year, is 354 days, 8 hours, 48 minutes, 34 seconds (354.36707 days), [1] purely lunar calendars are 11 to 12 days shorter than the solar year.

  6. Roman calendar - Wikipedia

    en.wikipedia.org/wiki/Roman_calendar

    The original Roman calendar is usually believed to have been an observational lunar calendar [2] whose months ended and began from the new moon. [3] [4] Because a lunar cycle is about 29.5 days long, such months would have varied between 29 and 30 days. [5]

  7. List of calendars - Wikipedia

    en.wikipedia.org/wiki/List_of_calendars

    Solar calendar with 13 months of 28 days. Badí‘ calendar: solar: Baháʼí: 1873: Baháʼí: Uses a year of 19 months of 19 days each and a 1844 era. Also known as the "Baháʼí Calendar" or the "Wondrous Calendar". Thai solar calendar: solar: Gregorian: 1888: Thailand: The Gregorian calendar but using the Buddhist Era (543 BC) Invariable ...

  8. 360-day calendar - Wikipedia

    en.wikipedia.org/wiki/360-day_calendar

    The 360-day calendar is a method of measuring durations used in financial markets, in computer models, in ancient literature, and in prophetic literary genres.. It is based on merging the three major calendar systems into one complex clock [citation needed], with the 360-day year derived from the average year of the lunar and the solar: (365.2425 (solar) + 354.3829 (lunar))/2 = 719.6254/2 ...

  9. Lunar month - Wikipedia

    en.wikipedia.org/wiki/Lunar_month

    Calendars count integer days, so months may be 29 or 30 days in length, in some regular or irregular sequence. ... /36525 and JD is the Julian day number ...