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On Time: From Seasons to Split Seconds
     

On Time: From Seasons to Split Seconds

by Gloria Skurzynski
 

A fascinating tour of time measurement through the ages. Children discover how humans learned to recognize time and began to measure it in smaller and smaller units from the precisely placed boulders at Stonehenge, which marked the equinoxes; to Egyptian obelisks, which measured the hours; to modern-day atomic clocks, which subdivide seconds.

Overview

A fascinating tour of time measurement through the ages. Children discover how humans learned to recognize time and began to measure it in smaller and smaller units from the precisely placed boulders at Stonehenge, which marked the equinoxes; to Egyptian obelisks, which measured the hours; to modern-day atomic clocks, which subdivide seconds.

Editorial Reviews

Children's Literature - Greg M. Romaneck
The concept of time is, by its very nature, both simple and complex. On a daily basis, people struggle to meet deadlines, be timely, and make good use of their time. Yet, what exactly is time and how have past societies attempted to measure it? These questions are addressed in this fascinating scientific study. The story begins with prehistoric human efforts to grasp the changing seasons. Later, people stopped relying solely upon lunar and solar traits to determine the date and time. They progressed to the development of calendars and various sundry approaches to chronology. Early sun dials, water clocks, and hourglasses are each presented as stages in mankind's efforts to measure time. As people reached out to travel the vast oceans or to use more complicated transport such as railroads, accuracy in time telling became increasingly essential. In the modern era, the boundaries between space and time have blurred as scientists observe the light of stars long extinct which has taken trillions of years to reach their eyes. All in all, this book provides a novel look at a subject that affects each of us all the time.
School Library Journal
Gr 4-7-This attractive offering is brimming with information about time and timekeeping, from seasons, years, and time zones to pendulums, hourglasses, and femtoseconds. The conversational tone helps readers get through the more difficult concepts, such as looking backward into deep time and deep space. Readers get a historical glimpse at the Tower of Winds, a laborious water clock built in Greece in 50 B.C. and Christopher Columbus's clever use of a lunar eclipse to win over the Haitian natives. Although the traditional "B.C." and "A.D." divisions are discussed, the more current "B.C.E." and "C.E." are not mentioned. The fact that hours, weeks, and months are man-made divisions is clearly explained. Skurzynski states that our January 1, 2000 occurs during the Hebrew year 5760 and the Islamic year 1420 A.H. The book is heavily illustrated with full-color drawings, photographs, and diagrams. It could be paired with Gillian Chapman's excellent Exploring Time (Millbrook, 1995), which offers related activities. On Time will find audiences with report writers and pleasure readers, as well as their teachers.-Anne Chapman Callaghan, Racine Public Library, WI Copyright 2000 Cahners Business Information.|

Product Details

ISBN-13:
9780792275039
Publisher:
National Geographic Society
Publication date:
04/28/2000
Pages:
48
Sales rank:
1,014,407
Product dimensions:
8.88(w) x 11.19(h) x 0.28(d)
Lexile:
1040L (what's this?)
Age Range:
4 - 8 Years

Meet the Author

Gloria Skurzynski has written more than 30 children’s books. Her nonfiction book, Almost the Real Thing, won the American Institute of Physics Science Writing Award. She has written several nonfiction books for National Geographic including Are We Alone, an NSTA Outstanding Science Trade Book for Young People and an IRA/CBC Young Adults’ Choice for 2006. She lives in Boise, ID. Visit Gloria Skurzynski at her Web site: www.gloriabooks.com.

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