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How do you tell time without a watch? Use the sun! The sun can be an accurate time telling device as long as you have the tools to help you. Many ancient peoples used sundials to keep track of time. The earliest sundials we know of are the shadow clocks (circa 1500 BC) that were used in Egyptian and Babylonian astronomy. Show your child how people were able to tell time long before analog, and then digital clocks, appeared on the scene.