《史记·八书·历书》
月朔大余二十四日，小余六百四十五分；冬至大余四十八日，无小余；
大馀二十四，小馀六百四十五；大馀四十八，无小馀；
The first day of the month is 24 days greater than that of the previous month, 645 minutes less than that of the previous month; the winter solstice is 48 days greater than that of the previous month, with no minutes less than that of the previous month;