Let's-Read-and-Find-Out Science (6) : What Makes Day and Night? 自然科学启蒙: 为什么会有白天和黑夜 （天文）

This series of books gradually introduces basic concepts of natural science to kids through vivid pictures and simple language that satisfies kids' needs to understand the scientific world. Many of the books contain simple activities for children to do. If you live on the moon, you will find that the days and nights are as long as two weeks on Earth! On Earth, we also have days and nights, but they add up to twenty-four hours. Use a lamp as the sun and yourself as the earth, and see why there is day and night.