Chinese culture on dating
Principal Term 11 (Winter Solstice) must always fall in the 11th month.All the astronomical calculations are carried out for the meridian 120 degrees east of Greenwich.The date of a new moon is the first day of a new month.Second, determine the dates when the sun’s longitude is a multiple of 30 degrees.(The sun’s longitude is 0 at Vernal Equinox, 90 at Summer Solstice, 180 at Autumnal Equinox, and 270 at Winter Solstice.) These dates are called the Principal Terms and are used to determine the number of each month: Each month carries the number of the Principal Term that occurs in that month.In rare cases, a month may contain two Principal Terms; in this case the months numbers may have to be shifted.
Instead years have names that are repeated every 60 years.For more than two millennia, a Bureau of Astronomy made astronomical observations, calculated astronomical events such as eclipses, prepared astrological predictions, and maintained the calendar.After all, a successful calendar not only served practical needs, but also confirmed the consonance between Heaven and the imperial court. Various intercalation schemes were developed for the early calendars, including the nineteen-year and 76-year lunar phase cycles that came to be known in the West as the Metonic cycle and Callipic cycle.) and there will be a leap month after the 12th month in 3358. According to Chinese tradition, the first year of the Yellow Emperor was 2698 B. E., so he introduced a counting system based on this. An alternative system is to start with the first historical record of the 60-day cycle from March 8, 2637 B. In the calendar that the Shang used, the seasons of the year and the phases of the Moon were all supposedly accounted for.Since the Chinese calendar is an astronomical calendar, predictions require delicate astronomical calculations, so my computations for 3358 should probably be taken with a grain of salt. In China, the calendar was a sacred document, sponsored and promulgated by the reigning monarch.
Analysis of surviving astronomical records inscribed on oracle bones reveals a Chinese lunisolar calendar, with intercalation of lunar months, dating back to the Shang dynasty of the fourteenth century B. From the earliest records, the beginning of the year occurred at a New Moon near the winter solstice. E., a calendar reform established the practice, which continues today, of requiring the winter solstice to occur in month 11.