Ca. 2000: The Egyptians are making shadow clocks.
Ca. 1500: The Stonehenge is build.
Ca. 800: The oldest, still existing sun-dial from Egypt.
45: The beginning of the Julian-calendar on January the first.
Ca 500: In this year the incense clock is invented.
600-900: The Maya design their calendar.
622: The beginning of the Islam-calendar.
Ca 800: The candle clock is invented.
Ca 1290: The first European mechanical clocks.
Ca 1300: The hour-glass are spread all over Europe.
Ca 1400: The first portable watch.
1504: The first pocket watch, made in Germany.
1582: The Gregorian imported.
1657: The pendulum clock is invented by Christiaan Huygens.
1675: Christiaan Huygens invents the coilspring clock.
1790: The first wristwatch.
1792: The beginning of the calendar: France Republic.
This one is abolished in 1795.
1840: The first electronic watch.
1884: International meridian conference, USA.
1922: The first automatic wristwatch.
1929: The first quartz clock.
1948: The first atomic clock, made in the USA.
1955: The first caesium-atomic clock.
1956: The first electronic wristwatch is sealed.
1967: The first quartz wristwatch.
1967: The second is regauged.
1991: The most exact atomic clock that ever is made.
