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A 12 hour clock using the sun and the shadow it casts on the gnomon to tell time
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This was also called a clepsydra that used the flow of water to tell time.
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Lighting the flames on ropes and marking candle wax to track the passing of time
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The first tool to tell time that wasn't dependent on the sun
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Analog clocks that could be worn or carried were first created
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The Earth revolves the sun annually, creating seasons. The Earth rotates in 24 hour periods, creating day and night