How did the ancients calculate time?

The child is ugly, and the mother hasn't applied this afternoon.

2 1 point to 1 point

1 point -3 o'clock ugly time

3: 00 to 5: 00 Yin Shi time.

............

Each hour is divided into 8 minutes, and one moment is equivalent to 15 minutes.

There are five classes in the evening. Class one is class two, class three is class three, ugly is class four and class five.