Time measurement

It is impossible to imagine modern life without exact hours. But how did the ancient civilization measured the time? What time scales existed in prehistoric times? How did the time measuring the navigators? The books of the series in a fascinating form narrow about the time - literally since the origin of our universe to modern atomic watches. The reader learn about the amazing history of the search by mankind of the most accurate ways to measure time, about calendars of different times and peoples, about how brave navigators learned to find a path to the stars. Colorfully illustrated, with many photos, these books contain material from many areas of knowledge: history, geography, astronomy, mathematics, linking him with the history of the development of civilizations, which contributes to the formation of a holistic picture of the world in children