《明史·志·卷十三》
余数化为秒，乘以一千，再除以一百四十四，六十分为一时，每日一千四石四十分，所以乘以一千，又除以一百四十四。按六十进制，满一百为一刻，就是食甚定时。
馀通为秒，以一千乘之，以一百四下四除之，以六十约之，满百为刻，即食甚定时。
The remainder is converted into seconds, multiplied by a thousand, and then divided by one hundred and forty-four, with sixty minutes equaling an hour, and one thousand four hundred and forty minutes per day, which is why it is multiplied by a thousand, and then divided by one hundred and forty-four. According to the sexagesimal system, every one hundred makes one ke, which is the time of total eclipse.