《北史·列传·卷七十七》
比如火星， 颈部 最初出现在立冬初，那么二百五十天运行一百七十七度；固定出现在夏至初，那么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；定见夏至初，则一百七十日行九十二度。
For example, the neck of Mars, firstly appears in early Lidong, then after 250 days, it runs 177 degrees; it is fixed to appear in early Xiazhi, then after 70 days, it runs 92 degrees.