He is doing research on Chinese solar terms.
他正着手研究于中国节气。
Early during the Spring and Autumn period, 2500 odd years from now, Winter solstice was first determined as the Chinese traditional solar term among the total 24 terms.
早在春秋时期到现在的2500多年，冬至日就是根据太阳周期的传统中国24节气中最先定下的节气。
The traditional Chinese lunar calendar divides the year into 24 solar terms.
中国传统的农历将一年分为24个节气。
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