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They used sundials to keep track of time using the sun. At "high noon", the sun was at its highest point, and in such a position that made the stick's shadow point at 12, then every "hour" after 12, they marked the dial in the other 11 places, making the first sundial. Sundials have advanced to use a triangle with a concavely curved side, and roman numerals instead of rocks and such. Also, they couldn't have minute hands due to the fact there couldn't be a second shadow for a second object in the center.

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14y ago

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Q: How did they use sundials?
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