Heavenly stems and earthly branches and the problem of quick calculation of sixty flowers

The mantissa is used to calculate the heavenly stems, and the pinch method is combined with the formula to calculate the earthly branches.

There are two fingering methods:

First, the index finger, middle finger, ring finger and little finger, each finger has three knuckles, and four fingers just correspond to the 12 ground branch.

Second, the index finger, middle finger and ring finger, each finger has three joint lines, and between them, three fingers correspond to 12 ground branches.

For example, 1984 is the year of Jiazi, marked with your index finger and fingertips. For example, 1999, which is different from 1984 by 15 years, subtracts the remainder 3 of 12, and the hand index 3 is gross (you can also count directly with your fingers at this time 15 years), and the mantissa of AD 9 corresponds to "yourself", so it is easy to get.

The year is fixed and the month is fixed. For example, the second month of Jiazi year can only be the third month, and the second hour of Jiazi day must be Jiazi time, with five days in a normal year and six days in a leap year. You can also calculate quickly by hand. Of course, the speed of operation requires exercise.