Day and night happen because the Sun lights one half of Earth while Earth rotates.
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LIVE VISUAL LAB
HOME
Interactive teaching model • relationships are controlled; scale, distance or timing may be simplified and are labeled here.
The big idea
Day and night happen because the Sun lights one half of Earth while Earth rotates.
A location has daytime while facing the Sun and nighttime after it turns into the unlit half. Different places can experience noon and midnight at the same moment.
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HOW SCIENTISTS KNOW
Space images show the day-night boundary, and time zones match a rotating spherical Earth.
WORDS TO OWN
daynightterminatorrotation
!A COMMON WRONG MODEL
The Sun travels around Earth once every day.
✓REBUILD IT WITH EVIDENCE
Keep the Sun fixed in a model and rotate Earth; day and night still appear.
A scientifically true sentence can still create a false picture. This repair makes the relationship visible.
Take learning into real life
Try it together
Use a ball as Earth and a stationary flashlight as the Sun. Rotate only the ball, mark one home location and explain what changes there. Connect what you notice to why we have day and night using day and night.
GREEN SAFETYOrdinary low-risk activity with normal caregiver awareness.
01TALKWhat do you predict before we try it?02LOOKWhat changed? What stayed the same?03EXPLAINWhich evidence supports your idea?
Check understanding
Which statement best explains why we have day and night?
Choose the explanation that matches the evidence—not just the most familiar words.
Three things to remember
✓Day and night happen because the Sun lights one half of Earth while Earth rotates.
✓A location has daytime while facing the Sun and nighttime after it turns into the unlit half.
✓Evidence matters: space images show the day-night boundary, and time zones match a rotating spherical earth.
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