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Cherokee calendar. The Cherokee calendar is traditionally defined as a Lunar calendar marked by 13 moon cycles of 28 days. [note 1] Each cycle was accompanied by a ceremony. In order to rectify the Cherokee calendar with that of the Julian calendar, these cycles were reduced to 12. The seasonal round of ceremonies was integral to Cherokee society.
The Tibetan calendar (Tibetan: ལོ་ཐོ, Wylie: lo-tho), or Tibetan lunar calendar, is a lunisolar calendar, that is, the Tibetan year is composed of either 12 or 13 lunar months, each beginning and ending with a new moon. A thirteenth month is added every two or three years, so that an average Tibetan year is equal to the solar year. [1]
The lunar seasonal calendar has 13 months [3] that do not correspond to the months of the Gregorian calendar. [4] Twelve of the lunar months (inyanga) of the Zulu calendar have around 28 days. [5] [6] Zulu names for the lunar months are based on observations of nature and seasonal activities. [7] A 13th intercalary month (iNdida) lasts four to ...
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.
Because astronomical observation determines month length, dates on the calendar correspond to moon phases. The first day of each month is the new moon. On the seventh or eighth day of each month, the first-quarter moon is visible in the afternoon and early evening. On the 15th or 16th day of each month, the full moon is visible all night.
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.