Activity 01
Model Building: Axial Tilt Orbit
Supply each small group with a lamp as the Sun, a foam ball for Earth marked with continents, a straw for the axis tilted at 23.5 degrees, and play-dough to hold it. Groups slowly revolve the ball around the lamp while keeping the axis fixed, noting shadow changes and light angles for each season. Record findings on a season chart.
Explain why different hemispheres experience opposite seasons.
Facilitation TipAt the Station Rotation for Sunlight Angles, place a lamp at each station and provide protractors and light meters so students can measure and compare light intensity at 0, 23.5, and 45 degrees of tilt.
What to look forProvide students with a diagram showing Earth at four points in its orbit around the Sun. Ask them to label each point with the corresponding season for the Northern Hemisphere and write one sentence explaining why that season occurs at that orbital position.