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In leap years, at least one month does not contain a Principal Term. It carries the same number as the previous month, with the additional note that it is the leap month.

In rare cases, a month may contain two Principal Terms; in this case the months numbers may have to be shifted.

Principal Term 11 (Winter Solstice) must always fall in the 11th month.

In addition, there will be a leap month after the 1st month in 2262 (in fact, it should have happened in 1651, but they got the calculations wrong! Before the 1911 revolution, Sun Yat-sen wanted to establish a republican alternative to the imperial reign cycles. 1800 - 1200 BCE) Evidence from the Shang oracle bone inscriptions shows that at least by the 14th century BC the Shang Chinese had established the solar year at 365¼ days and lunation at 29½ days.

Chinese New Year Celebrations Chinese New Year parades have their origins in the California Gold Rush, when immigrants sought to share their culture.

The choice of month for beginning the civil year varied with time and place, however. This reform also introduced the intercalation system in which dates of New Moons are compared with the 24 solar terms.

However, calculations were based on the mean motions resulting from the cyclic relationships.

Some variations in these rules are seen in various Chinese communities. To determine if a year is a leap year, calculate the number of new moons between the 11th month in one year (i.e., the month containing the Winter Solstice) and the 11th month in the following year.