On Time
Book Details
Author(s)Gloria Skurzynski
PublisherNational Geographic Children's Books
ISBN / ASIN0792275039
ISBN-139780792275039
AvailabilityUsually ships in 2 to 4 weeks
Sales Rank5,812,977
MarketplaceUnited States 🇺🇸
Description
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.










