Do you wonder how our ancestors told the time without using a clock? In the past, our ancestors used to tell the time by noticing the shadow of something called a "sundial"
A sundial shows the time of day by the position of the shadow of some object exposed to the sunlight. It is used since Ancient Egypt. Every day is divided into 12 equal portions. Gnomon is a shadow-casting object that is widely used either oriented vertically, horizontally, or aligned with the Earth's axis. The ray of light that hits the tip of the gnomon casts a shadow on the hour line on the surface. There are different types of sundial as well as their gnomon and surface. Thin rod and plane surface are the most common of sundial. We can easily make a sundial by following these steps.
How to make a sundial
1 Please a piece of cardboard or wood in an outside spot in the sun
2 Punch a stick through the bottom center of the cardboard
3 Put a thumb tack or push pin at the top of the cardboard where the shadow of the stick falls at the top of the hour in which you are beginning the record
4 Set the timer to sound off at the top of each hour
5 Write the number of the hour next to the thumb tack or push pin
6 Repeat the process until 12 hours are marked on the cardboard
These steps might take to finish, it might take more than a day. However it might be worth to use the sundial as our ancestors did in the past.