How to make a sundial

Before we had clocks and watches, people used sundials to mark the passing of time.

A sundial measures time by the sun's position and usually has markings for each hour of sunlight. Sundials have something in the centre that casts a shadow over the markings showing the time. There are lots of ways to make a simple sundial, you can draw around your shadow from the same central point at different times throughout the day, use stones or even just a simple straw or stick like we did.

On a real sundial, the central part ( gnomon ) usually sticks up at an angle from the dial plate ( base of the sundial ). It's the shadow of the gnomon that moves around.

How to make a simple sundial

What you need

A sunny spot
Pen or chalk
Straw or Stick
Plasticine

Instructions

You'll need a sunny spot that doesn't get shady.

If you're using chalk you can draw directly on the ground, otherwise pen and paper work well too.

We used plasticine to make the straw stay upright.

We started our recording at 12 noon and watched as the shadow of the straw changed over the afternoon, marking every hour. We were a bit late with one of our readings as you can see.