Retelling: This book traces the development of clocks from the Egyption sundial to the modern day atomic clock. The illustrations carefully demonstrate the inner workings of each style of clock.

Thoughts and feelings: Unfortunately, this book has no page numbers. I would love to tell you the page that my favorite diagram was on, the one that showed how the time zones move. The center of the circle is labeled "North Pole," making the device mimic the rotation of the earth so it's easy to understand why the different time zones are necessary if you don't want people in the United States to experience sundown at 11pm. Reading about clocks really makes you want to build models. I still don't feel like I can really understand unless I see things spin. Try getting your kids to bed!

Science
Describes the concept of time and how it has been measured throughout history, using water clocks, sundials, calendars, and atomic vibrations

Is time cyclical, measureable, or does it even exist? As you read this book on the history of time keeping devices and their evolution and understanding, you revisit all those questions you once asked as a young child. This history scientific discovery, and even language development and morpheme building. You learn that clock comes from the German word "Glocke" and hour means "one twelfth part" from the Romans and Greek, and gnomon from the Greek word "one who knows". i would present this book for 1st to 3rd graders on any number or lesson blocks on telling time using old hand clocks, to science lab and building your own sundial using a half bowl. The book was interesting and many utilities for instruction. ( )

This book is a history of clocks and how people used to tell time. It lets readers explore the science behind time and how before clocks people would look at the moon, sun, and water. Would be great introduction for a unit on time or even the sun/moon. ( )

Nice, mellow, detailed illustrations and diagrams.