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? How would you know when baseball season was about to start?. 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. And as time marched on, people came up with more ways to measure it. Today, quartz crystal watches and atomic clocks tell us exactly what time it is at any moment all over the world.
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LibraryThing ReviewUser Review - jresner - LibraryThing
This is a great informational book that teaches about the concept of time, and how humans are able to track time. It talks about early Egyptian days all the way to present day, and also talks about ... Read full review
LibraryThing ReviewUser Review - chris.coelho - LibraryThing
"How Do You Know What Time It Is?" is a book that helps younger students understand the concept of time. The book does a great job going all the way back to the beginnings of time, chronicling the ... Read full review