Sundial

Sundial Made by Jeffrey Holtz How It Works A Sundial is a big rounded thing that can cast a shadow to tell time. The round thing in the middle is called the "rigui". It has the numbers on it so when the pointy rods shadow goes on to it there will be a way to tell time.The pointy rod sticking out is called the "gnomon". This is very important. If the gnomom is in the wrong direction then the time is way off. When the sun moves then the shadow of the gnomon shows the time on the rigui. This helped many people back in ancient China.

Purpose

The Sundial was invented by a couple of chinese people wanting to know the time. People were getting mad that they always needed to look at the sun to have an idea of what the time is. So they made the idea of the sundial. They started with a huge rigui that was in the ground. When someone needed to know the time the person stood in the middle of it and look at there shadow. Who Invented It Theodusius invented the sundial in 574 AD. He was an inventor that made many inventions. People nagged him to make something to tell time. It took him 2 months to make the idea. At first it wasn't very popular but as people started to find out about the sundial it became more and more popular.Later many different types of the sundial came out. The sundial was also very accurate. How They Used The Sundial Everybody used a sundial in Ancient China. They watched the shadow and can tell the time. Look in the picture above. What ever the shadow is pointing to is what time it is.

How It Has Evolved Since the Sundial was made there has beed another invention based off the sundial. It is called the clock. The clock works by hands going around to show the time. The sundial help so much in the world. If we didn't have the sundial we would not have clocks, some technology would not be the same and most importantly we would be screwed up because we don't know the time. People around the world still use this amazing invention today! Think what life would be without the sundial.