I've done quite a bit of reading about calendars over the decades, but I
haven't spent much time 'understanding' lunisolar. Here's an example of
the long lead par in the wp article about .cn:
> The traditional Chinese calendar is a lunisolar calendar, combining
> the solar, lunar, and other cycles for various social and religious
> purposes. More recently, in China and Chinese communities the
> Gregorian calendar has been adopted and adapted in various ways, and
> is generally the basis for standard civic purposes, but
> incorporating traditional lunisolar holidays. However, there are many
> types and subtypes of the Chinese calendar, partly reflecting
> developments in astronomical observation and horology, with over a
> millennium plus history. The major modern form is the Gregorian
> calendar-based official version of the People's Republic of China,
> although Taiwanese and diaspora versions are also notable along with
> Chinese-influenced versions of various cultures; however, aspects of
> the traditional lunisolar calendar remain popular, including the
> association of the twelve animals of the Chinese Zodiac in relation
> to months and years.
... and ...
> The date of the Chinese New Year accords with the patterns of the
> lunisolar calendar and hence is variable from year to year.
>
> The invariant between years is that the winter solstice, Dongzhi is
> required to be in the eleventh month of the year[38] This means that
> Chinese New Year will be on the second new moon after the previous
> winter solstice, unless there is a leap month 11 or 12 in the
> previous year.[39][40]
>
> This rule is accurate, however there are two other mostly (but not
> completely) accurate rules that are commonly stated:[39]
>
> The new year is on the new moon closest to Lichun (typically 4
> February). The new year is on the first new moon after Dahan
> (typically 20 January)
>
> It has been found that Chinese New Year moves back by either 10, 11,
> or 12 days in most years. If it falls on or before 31 January, then
> it moves forward in the next year by either 18, 19, or 20 days.
... and ...
> Chinese New Year is a festival that celebrates the beginning of the
> lunar new year on the traditional lunisolar Chinese calendar. In
> Chinese, the festival is commonly referred to as the Spring Festival
... and ...
> Chinese New Year is one of the most important holidays in Chinese
> culture, and has strongly influenced Lunar New Year celebrations of
> its 56 ethnic groups, such as the Losar of Tibet, and of China's
> neighbours, including the Korean and Vietnamese New Years,[5] as
> well as in Okinawa.[6] It is also celebrated worldwide in regions
> and countries that house significant Overseas Chinese or Sinophone
> populations, especially in Southeast Asia. These include
> Singapore,[7] Brunei, Cambodia, Indonesia, Malaysia, Myanmar,[8] the
> Philippines,[9] Thailand, and Vietnam. It is also prominent beyond
> Asia, especially in Australia, Canada, Mauritius,[10] New Zealand,
> Peru,[11] South Africa, the United Kingdom, and the United States,
> as well as in many European countries.
...and...
> The first day of Chinese New Year begins on the new moon that appears
> between 21 January and 20 February
Pretty good article at WaPo:
https://www.washingtonpost.com/world/2024/02/10/chinese-new-year-lunar-dragon/
> What to know about Lunar New Year: The Year of the Dragon
... starting Feb 10 this year.
If you think all of that is whacky, study when the Christian Easter
occurs; which is what got me into calendar interest a long time ago.
--
Mike Easter