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Earth’s Orbit & Rotation Activity for Kids

Sundial DIY

  • Duration: 30-60 min
  • Difficulty: Easy
  • Cost: $0 to $5

Build a device that uses Earth’s rotation to tell time.

Visit The Full Lesson Download Instructions as PDF

Material List

  • 1Paper plate
  • 1Glue stick
  • 1Bendy straw
  • 1Compass
  • 1Pair of scissors
  • 1Roll of tape
  • 1Sharpened pencil
  • 1Sundial face printout (Link to download)

Instructions

  • 1Cut out the sundial and glue it to a paper plate.
  • 2Poke a hole through the center of the plate using the pencil.
  • 3Push the straw through the hole, and tape the short end underneath to hold it in place.
  • 4Take your sundial outside on a sunny day at noon and place it in a flat, sunny area.
  • 5Point the sundial north using the compass, and tilt the straw slightly north so it casts a longer shadow.
  • 6Observe the sundial over a few hours. The shadow of the straw tells you the time!
  • Tip:If you are in the Southern Hemisphere, anywhere the above instructions say north, you should use south.
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How It Works

The sun shining down on the straw creates a shadow on the sundial. In the Northern Hemisphere, the shadow points toward the west in the morning. Around noon, when the sun is close to overhead, the shadow is short and points north. When the sun is low at the end of the day, the shadow points east. The sundial simply labels each hour that goes by as the Earth rotates. Remember that even though it appears that the sun is moving across the sky, it is really Earth that is rotating!

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Check out the Full Lesson on Earth’s Orbit & Rotation

In this lesson, we learn that:

  • The earth rotates on its axis every 24 hours.
  • The earth orbits around the sun every 365.25 days.
  • Earth’s rotation causes observable patterns like night & day.
  • Earth’s orbit causes some stars to be visible only in certain months.

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