Why do shadows change size during the day?
Your shadow is long in the morning, short at noon, and long again in the evening. You didn't change size - so what changed? Use "because" and "when... then..."
A shadow forms when something blocks light.
Your body blocks sunlight, creating a dark area where the light can't reach.
The shape depends on the ANGLE of the light.
In the morning and evening, the sun is low in the sky.
Light hits you at a SLANTED ANGLE, so your shadow stretches out long behind you.
Like shining a flashlight from the side!
At noon, the sun is high overhead.
Light comes straight down, so your shadow is small and right underneath you.
Like shining a flashlight from above!
Put a toy on a table. Shine a flashlight from the side (low) - long shadow!
Shine from above (high) - short shadow!
Same toy, different shadow sizes!
Why shadows change:
Shadows change because the SUN'S POSITION changes throughout the day:
• Morning: Sun is low and to the east → Light hits at a slant → Long shadow pointing west
• Noon: Sun is high overhead → Light comes straight down → Short shadow directly below
• Evening: Sun is low and to the west → Light hits at a slant → Long shadow pointing east
The object doesn't change - only the ANGLE OF LIGHT changes!
🤔 Which thinking lens(es) did you use?
Select all the lenses you used:
🌱 A Small Everyday Story
"My shadow is SO long!"
"Look again at noon."
"It's tiny now! Did I shrink?"
"Did you? Or did something else change?"
The child looked up at the sun. Understanding dawned.
See more guidance →
🧠 Thinking habits this builds:
- Understanding angles and geometry
- Connecting sun position to effects
- Recognizing cause and effect in nature
- Observing patterns throughout the day
🌿 Behaviors you may notice (and reinforce):
- Observing shadows at different times
- Using shadows to tell rough time
- Experimenting with flashlights and shadows
- Understanding light angles
How to reinforce: "You figured out that YOU didn't change - the sun's position changed! The angle of light makes all the difference!"
🔄 When ideas are still forming:
Children might think shadows shrink because things get smaller, or that shadows are "attached" to objects.
Helpful response: "Try the flashlight experiment! Move the light around the same object and watch the shadow change."
🔬 If you want to go deeper:
- How did ancient people use shadows to tell time?
- Why is there no shadow at all during a solar eclipse?
- Can you make a sundial?
Key concepts (for adults): Light angles, shadow formation, sun's apparent motion, sundials.