Times of the Day is part of the "Measuring Time" book series. This book specifically describes different parts of the day. Time is defined as how long something takes and when something happens. Each day starts with the sunrise and is called morning. There are many things that happen each morning of each day.
Noon is when the sun is high in the middle of the sky and it is the middle of the day. There are many things that happen every day at noon. What do you think the part of the day is called that happens after noon? If you think it is afternoon, you are right. Evening follows the afternoon.