H2S Watch

2: The First Ever Watch Was a Piece of Stone (Kind Of)

Though historians believe the Sumerians were the first to record time in 2000 BC, the earliest evidence of using a physical object to keep time comes from the ancient Egyptians. What they did was carve a large, stone obelisk that would be placed in a specific location. As the sun moved, so did the stone’s shadow. They estimated the time from the length and direction of this shadow.