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.

This book effectively told about the history of time keeping and touched upon the way people relate to time in their lives. The pictures were informative, but informal making the material approachable to younger readers. Much of the specific facts may not easily be absorbed by all the readers, but a beginning notion that the world has not always been the way it is today, and something as simple as the time has changed over time. ( )