He was an expert on ancient Chinese astronomical literature.
他是研究中国古代天文学文献的专家。
There are chiefly two research ways as: (1) Calculating the astronomical phenomena in the records of ancient literature by new method in astronomy, the collect years could be elected.
研究途径主要有两条：1）根据古代天象记录，通过现代天文计算推定其年代；
There are chiefly two research ways as: (1) Calculating the astronomical phenomena in the records of ancient literature by new method in astronomy, the collect years could be elected.
研究途径主要有两条：1）根据古代天象记录，通过现代天文计算推定其年代；
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