The history of the clock

Year (B.C.)
3500 A sundial clock or a sun clock was first used around this time.
1400 Water clocks were invented.

Year (A.D.)
723 Two Chinese Men invented the "Water Power Armillary Sphere" with the function of telling time.
Actually, It is like an small observatory and "Striking clock". It will tell the time everyQuarter (Drum) and every Shi Chen (Bell) automatically --- one day was divided into 12 Shi Chen or 100 Quarters in the Chinese culture.
It is categorized as the first mechanical clock in the world because it has a part which is similar to an escapement.

1086 A Chinese Man invented the "Water Power Celestial Globe" which has all the functions of the "Water Power Armillary Sphere" and can display the current positions of the planets.

1335 French, Pierre Le Roy invented the first escapement. He also discovered "Pierre Le Roy's rule", whereby any balance spring has a certain length that makes it isochronous.

1364 Italian, Dondi built a clock with a planetarium for the palace in his native town of Padua in Italy.

1490 German, Peter Hele invented the first mainspring.

1504 German, Peter Hele invented the first portable timepiece.

1581 Italian, Galileo, Astronomer and Physicist, discovered the properties of the pendulum.

1587 Watchmaking industry commenced in Geneva.

1657 Dutch, Huygens, a Physicist, made the first pendulum controlled clock.

1675 Dutch, Huygens invented a flat balance spring for the balance in a watch.

1704 Peter and Jacob Debaufre, along with Nicolas Facio, are the first to use rubies in watch movements.

1735 John Harrison completed the first Marine Timekeeper H1

1787 Levi Hutchins invented the first mechanical alarm clock which could ring only at 4 am.

1801 Abraham Louis Breguet patented the Tourbillion.

1876 Seth E Thomas patented the mechanical wind-up alarm clock that could be set for any time.

1920 Quartz crystal clocks were invented.

1923 John Hardwood invented the first Automatic wrist watch.
Rotating bezel to adjust time or perform hand-winding
15 jewels movement

1949 NIST (National Institute of Standards and Technology) built the first atomic clock, which was based on ammonia (NH3).

1970 Hamilton releases the "Pulsar", the first electronic digital watch with L.E.D. .

1972 Longines and Seiko introduce a new type of digital display with the L.C.D. .

1977 The idea of Spring Drive was conceived in 1977 by an engineer at SEIKO EPSON's Suwa plant in Japan.

1989 IWC assembled the Ingeneur which was able to withstand a huge magnetic field of 500,000 A/m.

1999 NIST-F1, an atomic clock which is based on cesium (Cs), works with the accuracy to about one second in 20 million years.

2008 Seiko Spackwalk - designed and built to accompany the first private individual ( Richard Garriott ) to conduct a spacewalk.

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