Days within a month are also grouped into 9 or 10-day weeks known as (xn). Since 12 lunar months do not add up to a full solar year, a leap month ( rn yu) is added every three years. A lunar month takes 29.53 days, although this varies slightly, and the number is an average. Starting at new moon to first quarter moon, full moon then the third quarter moon, and returns back to its starting position. Such situation will occur on the new moons on 28 September 2057, 4 September 2089 and 7 August 2097, the Winter Solstice of 2021, Vernal Equinox of 2051, Spring Commences of 2083 and Vernal Equinox of 2084. Before 1873, lunar calendars, which were originally imported from China, were used in Japan for many centuries. The Chinese calendar year ends with the last winter month which is called (l yu). A lunar month can be defined as the time the moon takes to pass through each of its phases. This follow the KARI(Korea Astronomy and Space Science Institute) ( ). If there are 12 months, there will be 354 or 355 days in a year if 13 months, there will be 383 or 384 days. ![]() ![]() Each Chinese calendar year has a zodiac sign, 12 or 13 months and each month has 29 or 30 days. If the time of new moon (first day of the lunar month) or solar term is close to midnight, the dates of the relevant lunar month or solar term in the "Conversion Table" may have a discrepancy of one day. Korean calendar and Chinese calendar is same lunar calendar but have different date. It is also called the Lunar calendar, Yin calendar, Xia calendar or the old Chinese calendar. ![]() The uncertainty in the calculation of the time of moon phases and solar terms decades ahead may be up to a few minutes.
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