This chapter book offers a straightforward introduction to the concept of time and its measurement throughout history. It covers various inventions and methods, from early tools like hourglasses to more complex devices such as atomic clocks and chronometers, as well as the development of calendars. The book handles the topic in an informative and accessible manner, making it suitable for young readers curious about how time works and how humans have tracked it over centuries. The emotional arc is primarily one of discovery and intellectual engagement, rather than deep emotional processing. This book is ideal for a child who is beginning to ask questions about time, its history, or the science behind it. A parent might reach for this when their child shows an interest in how things work, or as a supplement to a school lesson on history or science. No specific scenes require previewing, as the content is purely educational. Younger readers (4-6) would benefit from it as a read-aloud with explanations, while older children (7-11) could read it independently to deepen their understanding of a fundamental concept.