Time throughout the ages By ngadek Mar 9, 1000 hourglass used in Europe in the 11th century Mar 9, 1300 first mechanical clocks in Europe Mar 9, 1400 first watches in Italy Mar 9, 1500 heliocentric system Copernicus argued the earth operated on a sun-centered system Mar 9, 1600 pendulum clocks European scientists and inventors discovered the use Mar 9, 1700 earth rotates around the sun Mar 9, 1800 24- hour clock system Mar 9, 1880 time zones Mar 9, 1880 international date line Mar 9, 1916 daylight savings