America's most celebrated astrophysicist invites young readers to explore the mysteries of the universe.

A brief history of time keeping and clock making

A cat describes her activities at various times throughout the day from morning to night. Features a clock with movable hands

Describes the relationship between a second, minute, hour, day, week, month, year, decade, century and millennium as measurements of time

Discusses the elements of time and various ways to measure it, from shadow clocks and digital watches to calendars and time zones.

"Turn the hands to show the time, then lift the flaps to see if you're right. These pages are filled to the brim with time-telling challenges. Use the clock to complete the tasks and become a master of time." --