How Do You Know What Time It Is?

What would life be like with no clocks and no calendars? How would you know when to get up in the morning? Long, long ago, all people could do was watch the sun and moon and try to figure things out. Eventually, they made simple clocks like sundials. 

Introduces the concept of time while explaining how the process of measuring it began with the Egyptians and their use of a shadow stick and the rays of a sun, enhanced with full-color illustrations.