A mathematics professor from UC Berkeley, currently on sabbatical and at the National University of Singapore, has posted this information about the Mathematics of the Chinese Calendar. Professor Helmer Aslaksen gives some background on why he has developed this webpage, noting that "Chinese New Year is the main holiday of the year for more than one quarter of the world's population; very few people, however, know how to compute its date." Having little success in finding any information on the rules of the Chinese Calendar, he decided to work it out himself. Posted here are some of his papers on the Mathematics of the Chinese Calendar, along with an overall explanation of his method of calculation and several astronomical Java Applets and Animations to help explain the motion of the Earth and the Sun. His website on Heavenly Mathematics provides further ideas on ways to teach astronomy in a cultural context.
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