1. Students observe how their (sun) shadow changes throughout the day and seasons. \ 90 o Me and My Shadow

2. A shadow is created when an object blocks a light source, leaving an unlit area. The size of the shadow depends on the size of the object and the position of the light source.

3. Shadows and Sunlight 90 o 30 o The shadow you create by blocking sunlight changes through the day as the position of the sun in the sky changes.

4. Shadows and Sunlight You can determine the position of the sky by using your height, your shadow length and some simple trigonometry Angle = ArcTan (your height / your shadow’s length) your height your shadow’s length If your height = 100 cm and your shadow’s length = 100 cm: Angle = ArcTan (100 cm / 100cm) = ArcTan (1) = 45 degrees

5. Shadows and Sunlight The angle can also be determined graphically with a protractor. Graph as shown below with X=shadow length, y=height 100 cm 45 o

6. Shadows and Sunlight The angle can also be determined graphically with a protractor. Graph as shown below with X=shadow length, y=height 100 cm 30 cm 73 o