Calendars

It is impossible to imagine modern life without accurate hours. But how did ancient civilizations measured time? What time scales existed in prehistoric times? How did the time measurement helped sailors? Books of the series in a fascinating form telling about time - literally from the moment of the emergence of our universe to modern atomic hours. The reader learns about the amazing story of humanity searches for the most accurate ways to measure time, about calendars of different times and peoples, about how brave sailors learned to find a way along the stars. Colorfully illustrated, with many photographs, these books contain material from many areas of knowledge: history, geography, astronomy, mathematics, linking it with the history of the development of civilizations, which contributes to the formation of a holistic picture of the world in children