The sundial
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.
Scientists believe it was in about 3500 BC (about 5500 years ago).
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.
using a sundial
He used a portable sundial.
a sundial is a device that was used to tell time a long time ago. here is a vid that will tell you all about them: http://www.youtube.com/watch?v=tI0GqYJha1Q
He didn't. The sundial, or gnomon has been used since antiquity.
In Ancient Times
You need direct sunlight to use a sundial, so it cannot be used at night or when clouds or pollution are diffusing the sunlight too much to create shadows.
A sundial
A sundial
The sundial
Well, for starters you just used sundial in a sentence. But another sentence could be... Sundials help you tell time.
sundial
* theodolite * protractor * sundial * the hand
i dont have a clue lol