CURIOUS MINDS · HOME STEM
How to Make a Simple Shadow Clock With Kids
A shadow clock is a small, accessible project that turns a patch of ground or a sunny window into a lesson about the sun, time and observation. For children this activity is sensory and concrete: they place a stick or object, watch the shadow change, and mark moments across the day. The goal isn’t to build a precise instrument but to encourage curiosity, precise watching and simple recording. The steps below are written for family settings and include low-cost and no-cost alternatives, age-flexible prompts, and a clear cleanup/reset routine. When sunlight and safe outdoor space aren’t available, there are indoor versions using a lamp; keep heat sources adult-supervised. For questions about safe outdoor activities or sun protection policy, refer to official public health guidance.
Materials and low-cost alternatives
Gather a few simple things: a straight stick or dowel about 20–30 cm long, a small flat stone or piece of clay to anchor it, a watch or phone for timekeeping, and paper with a marker for recording. Low-cost alternatives: instead of a wooden dowel, use a sturdy pencil or a thick straw stuck into a bit of modelling clay; instead of paper, use a notebook, a whiteboard, or a strip of recyclable cardboard. Inclusive notes: choose materials that match your child’s abilities — a thicker stick is easier for little hands to hold, a heavier base keeps the stick upright for windy days.
Preparation tips: pick a spot that will be sunny for a chunk of the day (a backyard, balcony, or sunny windowsill). If you’re using an indoor lamp to simulate the sun, pick a high shelf where the lamp can be fixed so it won’t be disturbed; always keep lamps and bulbs out of reach and under adult supervision to avoid heat risks.
Age-flexible options: for preschoolers, use bold crayons and big paper for recording simple observations like “long” and “short” shadows; for school-age children, provide graph paper or a table to note the time and shadow length and to sketch more accurate positions.
Set up and make the shadow clock (step-by-step)
Step 1 — Place the stick: Push the stick upright into soil or modelling clay so it stands straight. If you are on a hard surface, use a small rock ring and sticky tack to stabilize it. Adult supervision: make sure the stick is secure and that nearby children won’t trip over it.
Step 2 — Mark the first shadow: At a known time — for example, 9:00 a.m. — place a small mark on the ground or a piece of tape on cardboard where the tip of the shadow falls. Label that mark with the time. Younger children can press a coin or pebble at the tip; older children can draw a precise dot with a marker.
Step 3 — Repeat through the day: Return every 30–60 minutes to mark the shadow tip and time. For families with limited availability, take fewer marks (three to five through the day) and ask the child to choose the times. This keeps the activity child-led and manageable.
Observe, record and question (making learning child-led)
Encourage children to watch the shadow each time and describe what they notice: Is it moving clockwise? Getting longer or shorter? Where is it compared to the first mark? For younger children, use simple language and comparison words (‘longer’, ‘shorter’, ‘near’). For older children, introduce concepts like cardinal direction, and ask them to predict where the next shadow might land.
Recording options: have preschoolers draw a big line for each shadow and colour-code times; older kids can make a neat diagram with times listed and the shadow lengths measured with a ruler. If your child likes photography, take photo stamps of the shadow positions and compile them in a small album.
Questions to prompt curiosity: What happens to the shadow near midday? Why do you think the shadow moves? Which direction is it moving? If your family is outdoors in different locations across the week, compare shadow paths from each place.