How Do You Know What Time It Is? (Wells of Knowledge Science Series) (Paperback)
Albert Whitman & Company, 9780807579404, 32pp.
Publication Date: January 1, 2002
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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.