《隋书·列传·卷四十三》
比如荧惑星前一次很快在立冬初首次出现，二百五十天运行一百七十七度，第二次必出现在夏至初，一百七十天运行九十二度。
即如荧惑前疾初见在立冬初，则二百五十日行一百七十七度，定见在夏至初，则一百七十日行九十二度。
For example, the last time the Venus appeared very quickly at the beginning of the beginning of winter, it ran 177 degrees in 250 days, and the second time it must appear at the beginning of the summer solstice, running 92 degrees in 170 days.