Shadow Speed Clocker: Solar Rotation Tracking
5 mins
Ages 7-9
Outdoor
An engaging, screen-free learning activity that builds real-world creativity and critical thinking for kids aged 7 to 9.
Materials Needed
- • Straight wooden dowel or garden stick (30cm) (1)
- • Sidewalk chalk stick or white contrast pebbles (3)
- • Metric ruler with millimeter gradations (1)
Pro Tips
- → Do this during mid-morning or mid-afternoon when shadows move rapidly and are elongated.
- → Ask: "Is the sun moving, or are we spinning through space right now at 1,000 miles per hour?"
- → Return 10 minutes later to verify the millimeter delta with the ruler.
Safety First
Never look directly at the sun. Always focus solely on the shadow cast on the ground.
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Step-by-Step Instructions
1
Step 1
Push a straight stick firmly into a flat sunny dirt patch or stand it in a mound of clay on a smooth concrete driveway.
2
Step 2
Use chalk or a white pebble to pinpoint the exact apex tip of the cast shadow at minute zero.
3
Step 3
Wait quietly for 3 minutes without disturbing the gnomon, then mark the new shadow tip and measure the precise distance travelled with your ruler.
What they are learning
Earth's rotational speed (15 degrees per hour)
Solar shadow geometry and gnomon tracking
Sub-centimeter temporal observation