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What is the sundial used for?
To tell time they were used thousands of years ago. It was used to see the time by the sun's ray's shadow. The Romans were the first to create the very first sundial called the gnomon. It was basically a stick in the ground with markings around it so as the shadows hit the markings whatever number that marking was is what time it is.
How did they know what time to set the first invented clock?
They knew what time it was because they could tell the time by looking at the sun. Whatever angle the sun was at, told them the time. So, they just looked at the sun for the time when clocks were first invented. Or they just used a sundial.
What is the oldest instrument used to measure time?
The sundial
How were clocks invented?
Clocks have been around since ancient times. The origins are not exact but it is widely known that the sundial was the first instrument used to measure time. Using the exact point of midday the sundial morphed into the obelisk that the Egyptians used to pinpoint midday.
What tool is used to measure time?
In the past, a common time measuring instrument was the sundial. Today, the usual measuring instruments for time are clocks and watches. For highly accurate measurement of time an atomic clock is used. Stop watches are also used to measure time in some sports.
