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The egyptians were the first to bring up the sundial , the sun’s shadow tells what time of the day / night it is . Ours are longer in summer and shorter in winter.
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The Greeks then invented the water clock ( also known as a clepsydra ) , it measures the flow of water in a cone type of vessel. There are two types of water clocks - inflow & outflow .
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Mechanical clocks were built in Europe made from a mainspring and balance wheel . not that evolved like the clocks we have now, but still mechanical .
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Christiaan Huygens invents the first pendulum clock on earth it is capable of far more than any other time telling objects ( the accuracy ). It doesn't work when you are at sea.
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The telegraph was invented and it has instant transmission of time signals.( in can immediately send time signals )
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The radio time signal was invented and sent / transported to Washington DC to help ships find longitude .
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The National Bureau of Standards invents the first atomic clock using ammonia . ( a clock based on the study of atoms )
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A second is now said as ( scientifically ) 9,192,631,770 vibrations of the cesium atom. So it is more advanced and we can see time by seconds too.
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Now that they have made watches we have a more advanced way of reading time and almost half a billion watches are sold every year.
