Who needs a watch? Let the sun tell the time!

Sundials are a way to tell the time using only the shadow that the sun casts and some simple materials. Most likely invented in Ancient Babylon around 1500 BCE, sundials were used to track time long before clocks, watches, or yes, even smart phones. This low-tech approach to telling time may not be used too much anymore, but it’s still really cool…and the best news is, you can build your own sundial in just a few short steps with a few basic materials!


You will need:

  • A pencil or very straight stick

  • Rocks

  • Playdoh or clay (optional)

  • Sun!

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Step One:

Take your materials outside on a sunny day and put your pencil or stick upright. You can do this (with an adult’s help, if necessary) by sticking it into the ground or, if you don’t have soft ground nearby, by making a disk with clay as a base.

Step Two:

You will notice that your pencil casts a shadow. Mark where the shadow lands with a small rock.

Step Three:

Check your sundial every hour, marking where the shadows land with a rock each time. Once the first hour passes, try and predict where the next hour markers will fall!

Try this project at different points during the summer, spring, fall, and winter and make notes in your Nature Observation Journal about how long the shadows are, if there’s any difference in the space between the hour markers, or any other changes you may find!

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