A series of photos of a woman with a hat and a flower

"Twenty-four solar terms" and "December construction" are the basic contents of the dry branch calendar，December is a solar term month based on the 24 solar terms。The orientation pointed to by the handle of the Big Dipper is used as the standard for determining the month，It is called doujian（Monthly construction）。The handle rotates clockwise for one cycle，One of the "years"。In every year，The handle rotates and refers to the twelfth in turn，Called "December Build"。December was established：New Year Moon，Founded in February，March Jianchen，Founded in April，May noon，June Jianwei，July Jianshin，August Jianyou，September Jianjun，October Jianhai，November Jianzi，December built ugly。The division of "December construction" is based on the festival order，That is, to start spring、Sting、clear and bright、Lixia、Mangsang、Light summer、Autumn、Lu、Cold dew、Lidong、Oyuki、Xiaohan，Respectively as Yin Yue、April、Tatsuki、Mitsuki、Midnight Moon、Not monthly、Shen Yue、Youyue、Moon、Hai Yue、Sub-month、The beginning of the ugly moon。In ancient times, the solar terms were established as the basis for "fighting and shifting stars"（The bucket handle points to），The current establishment of solar terms is based on the "solar annual visual movement"（Yellow longitude degree）；The two methods of establishment are different, though，In fact, the cause of the star shift is that the Earth revolves around the sun，Therefore, the intersection time of the two methods is basically the same

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