Воплощение времени. История часов: от солнечных до атомных

The history of clocks from ancient times to the present day. How was time measured in Ancient Egypt and China? What are sundials, water clocks, sand timers, and fire clocks, and when did the first clock mechanisms appear? What kind of clocks did Europeans and our compatriots use in past centuries and how have clocks changed today?
For elementary school age.