The Secret of the Sun and Moon: Why Do We Have Day and Night? is a gentle science picture book that makes looking up at the sky fun. The sun shines brightly upon us, while the moon watches over us gently. Knowing these two take turns watching over our world makes day and night feel even more special. This book answers children's simple question, “Why do we have day and night?” with adorable illustrations and easy-to-understand words. After reading it, your child will surely want to greet the sky with “Good morning, Sun!” in the morning and “Good evening, Moon!” at night.