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  2. Ecclesiastical new moon - Wikipedia

    en.wikipedia.org/wiki/Ecclesiastical_new_moon

    An ecclesiastical new moon is the first day of a lunar month (an ecclesiastical moon) in an ecclesiastical lunar calendar. Such months have a whole number of days, 29 or 30, whereas true synodic months can vary from about 29.27 to 29.83 days in length. Medieval authors equated the ecclesiastical new moon with a new crescent moon, but it is not ...

  3. Solar term - Wikipedia

    en.wikipedia.org/wiki/Solar_term

    Gregorian dates are off by one or two days at most; In the first half of the year, jieqi happens around the 6th and 21st day of each (Gregorian) month; In the second half of the year, jieqi happens around the 8th and 23rd day of each (Gregorian) month.

  4. Lunar calendar - Wikipedia

    en.wikipedia.org/wiki/Lunar_calendar

    A lunisolar calendar was found at Warren Field in Scotland and has been dated to c. 8000 BC, during the Mesolithic period. [2] [3] Some scholars argue for lunar calendars still earlier—Rappenglück in the marks on a c. 17,000 year-old cave painting at Lascaux and Marshack in the marks on a c. 27,000 year-old bone baton—but their findings remain controversial.

  5. Thai calendar - Wikipedia

    en.wikipedia.org/wiki/Thai_calendar

    The reckoning of the Buddhist Era in Thailand is 543 years ahead of the Gregorian calendar (Anno Domini), so the year 2025 AD corresponds to B.E. 2568. The lunar calendar contains 12 or 13 months in a year, with 15 waxing moon and 14 or 15 waning moon days in a month, amounting to years of 354, 355 or 384 days.

  6. Chinese calendar - Wikipedia

    en.wikipedia.org/wiki/Chinese_calendar

    The traditional Chinese calendar, dating back to the Han dynasty, is a lunisolar calendar that blends solar, lunar, and other cycles for social and agricultural purposes. . While modern China primarily uses the Gregorian calendar for official purposes, the traditional calendar remains culturally significa

  7. Jens Olsen's World Clock - Wikipedia

    en.wikipedia.org/wiki/Jens_Olsen's_World_Clock

    The Synchronoscope is the leftmost dial in the left section, and shows the time of day anywhere in the world. This is accomplished with a fixed map (in the form of a southern pole projection) around which a 24-hour dial rotates. This module also generates the impulse signal to the Gregorian Calendar (directly below it) and the Julian Period ...

  8. Solar cycle (calendar) - Wikipedia

    en.wikipedia.org/wiki/Solar_cycle_(calendar)

    The solar cycle is a 28-year cycle of the Julian calendar, and 400-year cycle of the Gregorian calendar with respect to the week. It occurs because leap years occur every 4 years, typically observed by adding a day to the month of February, making it February 29th. There are 7 possible days to start a leap year, making a 28-year sequence. [1]

  9. Epact - Wikipedia

    en.wikipedia.org/wiki/Epact

    A solar calendar year has 365 days (366 days in leap years).A lunar calendar year has 12 lunar months which alternate between 30 and 29 days for a total of 354 days (in leap years, one of the lunar months has a day added; since a lunar year lasts a little over ⁠354 + 1 / 3 ⁠ days, a leap year arises every second or third year rather than every fourth.)