《北史·列传·卷七十七》
太阳运行，从秋分以后到春分，其态势快，总计一百八十二天而运行一百八十度；从春分以后到秋分，太阳运行缓慢，总计一百八十二天而运行一百七十六度。
日行，自秋分已后至春分，其势速，计一百八十二日而行一百八十度；自春分已后至秋分，日行迟，计一百八十二日而行一百七十六度。
The sun travels from the autumnal equinox to the vernal equinox with the speed of 180 degrees per 182 days. It travels from the vernal equinox to the autumnal equinox with the speed of 176 degrees per 182 days.