1, 07: 00 am to 09: 00 am, refers to the time from sunrise to two hours after sunrise (usually dawn). In ancient China, a day was divided into twelve hours.

2. Morning refers to the period from midnight after 12 to noon at 1 1: 59, and also refers to the period from 9 am to 1 1: 00.

3. At noon, in ancient China, the day was divided into twelve o'clock, while in modern 24-hour system, the noon is 1 1: 00 to 13: 00.

4. In the afternoon, compared with the morning, the period from noon 12 to 18 generally refers to the period from noon 12 to sunset.

5. Evening refers to the time from sunset to sunrise tomorrow, when the sun is below the horizon and starts at about 19.