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Egyptians told time using an obelisk to mark the movement of it's shadow throughout the day
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The ancient Chinese burned a thick rope knotted in intervals to tell time
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Ancient Greeks and Romans used water clocks (Clepsydra) to use the flow of water to measure time
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Ancient Chinese also used the time it took to burn a candle to tell time
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Babylonians used a sun dial with a 12 hour clock face to tell the time based on the dial's shadow
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Europeans used the hourglass to tell time. Time was measured by the length of time necessary for the sand or water to fall from the upper chamber to the lower one.
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Mechanical clocks used weights and balances to denote time over a 12 hour period, but they didn't keep accurate time
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The Italians created wearable time pieces that contained coiled springs inside a metal ball with a lid
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European mechanical clocks became more reliable time keepers with the addition of a pendulum
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Standard time was developed, wherein the earth was divided into 24 equal time zones from top to bottom, with one hour difference between each neighboring time zones
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An imaginary line drawn through the Pacific Ocean on the 180th meridian that marks the point where travelers change their date by one day
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The first digital clocks were invented in 1883 in Austria using an enamel dial and numbers that rotated on a disc
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System in which many countries set clocks one hour ahead in the spring to delay sunrise and sunset in order to maximize the number of hours in a work day
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The most accurate method to tell time. Uses an electronic transition frequency in the microwave, optical, or ultraviolet region of the electromagnetic spectrum of light to tell time
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Accurate system adopted around the world as the official measure of time for the planet, with Greenwich, England as the zero point for the world's time zones
