I happen to be ethnically Chinese, and I posted information about traditional Chinese calendar on a related thread on the Religion forum. Here's what I wrote:
Traditional Chinese calendar is built with both lunar and solar cycles in mind. Months reflect moon cycles, with a 13th month added approximately every three years to take account of disprency between solar and lunar cycles (If we base the calender purely on lunar cycles, the result would be like Islamic calendar which is useless for agricultural purposes - all special days (not holidays) in Chinese calendars are based on weathers).
Years are usually formed with a 60 year cycle with a combination of two words. In conjunction traditional year name of the emperor is also used with the year name (so we will say Fifth year of blah blah blah, year blah blah in traditional Chinese calendar). Since 1912 with the successful Revolution overthrowing the Qing dynasty and the proclaimation of the Republic of China, China has formally been on Gregorian calendar (except that very often year names were written in xth year of the ROC. This practice has effectively ended with the Communist People's Republic of China in power). However, the old calendar's new year day is still a formally recognized statuatory holiday in China.
How do you calculate the Chinese New Year? Twentieth day of the Twelveth Moon? What about intercalary years? How do you determine when an intercalary year occurs? Are moon dates (lunations) counted from New Moon (almost the Judeo-Islamic style) or Full Moon? Who decides the age of the moon? Is any particular meridan preferred? In any strict solar/lunar calendar assignment of dates to events (lunations, solstices or equinox) is dependent on the choice of meridan and defintion of the start of a day. Who decides these things for the Chinese calendar and how?
Thanks!