|Tianbu zhenyuan 天步眞原. Chunqiu xiazheng 春秋夏正|
|Tianbu zhenyuan 天步眞原 / [Mu Nige zhuan 穆尼閣撰] ; Xue Fengzuo zhuan 薛鳳祚撰 [i.e. 譯]. Chunqiu xiazheng 春秋夏正 / Hu Tianyou xue 胡天游學.|
"Xue Fengzuo 薛鳳祚, one of the great astronomers of the time, studied with Nikolaus Smogolecki in the Jiangnan region, after having been trained in traditional Chinese astronomy in his youth. Together they wrote Tianbu zhenyuan 天步眞原 (True Source of the Pacing of Heavens, ca. 1646), which introduced the European horoscope." –Cf. N. Standaert, Handbook of Christianity in China, p. 726.