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An early prototype of the alarm clock was invented by the Greeks around 250 BC. The Greeks built a water clock where the raising waters would both keep time and eventually hit a mechanical bird that triggered an alarming whistle.
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In 1504, Peter Henlein created the first portable (but not very accurate) timepiece in Nuremberg, Germany.
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In 1577, Jost Burgi created the minute hand for Tycho Brahe, who needa clock for accurate stargazing.
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In 1656, Christian Huygens invented the pendulum, which made clocks more accurate.
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in 1878, Sir Sandford Fleming invented standard time.
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Swiss John Harwood invented the self-winding watch in 1923.
