A sundial is a device that measures time by the position of the Sun
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A Sun dial
How about a sun dial, an automatic or battery operated watch.
There have been many methods of keeping time. One of the most famous is the Sun Dial or simply tracking the position of the sun and its shadows
A clock face is also called a dial, face dial, clock face dial, or dial face.
I'm pretty sure they measured it by using a tool called a sun dial. It's powered by the sun's shadows. sun dials, water drop clocks, sinking clocks, candles - to name a few. =================================================== The sundial is the world's oldest scientific instrument.